8 Now go, write it on a tablet before them And inscribe it on a scroll, That it may serve in the time to come As a witness forever. 9 For this is a rebellious people, false sons, Sons who refuse to listen To the instruction of the LORD; 10 Who say to the seers, “You must not see visions”; And to the prophets, “You must not prophesy to us what is right, Speak to us pleasant words, Prophesy illusions. 11 “Get out of the way, turn aside from the path, Let us hear no more about the Holy One of Israel.” Isaiah 30:8–11 (NASB95)

8 Now then, sit and write these things on a tablet and in a scroll, because these things will be for days of time and as long as into eternity. 9 Because it is a resistant people, lying sons who are unwilling to listen to the law of God, 10 who say to the prophets, “Do not report that to us,” and to those who see the visions, “Do not speak that to us, but rather speak to us and report to us a different deception; 11 and turn us back from this way; remove this path from us, and remove the oracle of Israel from us.” Isaiah 30:8–11 (LES2)

12 Therefore thus says the Holy One of Israel, “Since you have rejected this word And have put your trust in oppression and guile, and have relied on them, 13 Therefore this iniquity will be to you Like a breach about to fall, A bulge in a high wall, Whose collapse comes suddenly in an instant, 14 Whose collapse is like the smashing of a potter’s jar, So ruthlessly shattered That a sherd will not be found among its pieces To take fire from a hearth Or to scoop water from a cistern.” Isaiah 30:12–14 (NASB95)

12 Because of this, this is what the Holy One of Israel says: “Because you resisted these words and hoped on a lie, and because you grumbled and began trusting on this word; 13 because of this, this sin will be for you like a wall that falls suddenly when a secure city is captured, whose fall comes suddenly; 14 and its fall will be like the breaking of a clay vessel, tiny pieces from a jar, so that there cannot be found among them a shard in which you will carry fire and whistle a little water. Isaiah 30:12–14 (LES2) 

15 For thus the Lord GOD, the Holy One of Israel, has said, “In repentance and rest you will be saved, In quietness and trust is your strength.” But you were not willing, 16 And you said, “No, for we will flee on horses,” Therefore you shall flee! “And we will ride on swift horses,” Therefore those who pursue you shall be swift. 17 One thousand will flee at the threat of one man; You will flee at the threat of five, Until you are left as a flag on a mountain top And as a signal on a hill. Isaiah 30:15–17 (NASB95)

15 This is what the lord Lord says, the Holy One of Israel: “When you turn back, you groan; then you will be delivered, and you will know where you were; when you put trust in the things without avail, your strength came to no avail, and you were unwilling to listen. 16 Instead you said, ‘We will flee on horses!’ Because of this, you will flee! And ‘We will be upon swift riders!’ Because of this, those pursuing you will be swift! 17 At the voice of a single person, a thousand will flee, and at the voice of five, many will flee, until you are left like a pole on a mountain and like one who carries a standard on a hill. Isaiah 30:15–17 (LES2)

This passage contains a huge departure from the truth by the MT in verse 15. The LXX essentially says that Israel will be delivered when she repents from trusting in vain things and disobeying God. The well-known verse – “In repentance and rest you will be saved. In quietness and trust is your strength” – does not exist in the LXX. Instead, we have, “When you turn back, you groan, then you will be delivered, and you will know where you were, when you put your trust in [useless things]…and..were unwilling to listen.”

Verses 16 and 17 show agreement.

18 Therefore the LORD longs to be gracious to you, And therefore He waits on high to have compassion on you. For the LORD is a God of justice; How blessed are all those who long for Him. 19 O people in Zion, inhabitant in Jerusalem, you will weep no longer. He will surely be gracious to you at the sound of your cry; when He hears it, He will answer you. 20 Although the Lord has given you bread of privation and water of oppression, He, your Teacher will no longer hide Himself, but your eyes will behold your Teacher. 21 Your ears will hear a word behind you, “This is the way, walk in it,” whenever you turn to the right or to the left. Isaiah 30:18–21 (NASB95)

18 And again God will remain to have pity on you, and because of this, he will be exalted to show mercy to you, because the Lord your God is a judge. Blessed are those who remain for him. 19 Because a holy people will reside in Zion, and Jerusalem has wept with weeping, “Have mercy on me!” he will show mercy to you for the sound of your crying. When he saw it, he listened to you. 20 And the Lord will give you the bread of oppression and scant water, and those who mislead you will not approach you any longer, because your eyes will look at those who mislead you, 21 and your ears will hear the words of those who mislead you from behind, those who say, “This is the way, let us go on it, whether right or left.” Isaiah 30:18–21 (LES2)

Verse 18 shows a lot of agreement. My opinion is because the LXX is a positive message for Israel, which the Masoretes did not see a need to change. 

“Blessed are those who remain [Greek – meno: abide, continue in] him,” which is found in the LXX is similar to what Jesus told his disciples.

4 Abide [Greek – meno]  in Me, and I in you. As the branch cannot bear fruit of itself, unless it abides in the vine, neither can you, unless you abide in Me. John 15:4 (NKJV)

Perhaps this passage should be understood to apply to the “Israel of God,” those who put their faith and allegiance in Christ. This could be the proper understanding of the “holy people” who will reside in Zion mentioned in verse 19. 

Verses 20-21 in the MT agree with the LXX. God will eventually deliver Israel from deception. It must be noted, however, that those who will be saved in Israel will always only be a remnant, just as is the case with the rest of the people in the world. (Romans 9:29) The “all Israel” of Romans 11:26 is the church of our Lord Jesus Christ, composed of Jews and Gentiles, through whom God will be glorified throughout eternity, (Ephesians 3:21)

22 And you will defile your graven images overlaid with silver, and your molten images plated with gold. You will scatter them as an impure thing, and say to them, “Be gone!” 23 Then He will give you rain for the seed which you will sow in the ground, and bread from the yield of the ground, and it will be rich and plenteous; on that day your livestock will graze in a roomy pasture. 24 Also the oxen and the donkeys which work the ground will eat salted fodder, which has been winnowed with shovel and fork. Isaiah 30:22–24 (NASB95)

22 And you will defile the silver-plated and gold-plated idols; you will make them into tiny pieces, and you will scatter them like the water of a woman who is sitting apart, and you will thrust them out like dung. 23 Then there will be rain for the seed of your land, and the bread of the produce of your land will be an abundance and rich. And on that day your livestock will be fed at a fertile and spacious place. 24 Your bulls and cattle that work the land will eat straw prepared with winnowed barley. Isaiah 30:22–24 (LES2)

25 On every lofty mountain and on every high hill there will be streams running with water on the day of the great slaughter, when the towers fall. 26 The light of the moon will be as the light of the sun, and the light of the sun will be seven times brighter, like the light of seven days, on the day the LORD binds up the fracture of His people and heals the bruise He has inflicted. Isaiah 30:25–26 (NASB95)

25 And on every lofty mountain and on every high hill, there will be running water on that day, when many will perish, when towers will fall. 26 And the light of the moon will be like the light of the sun, and the light of the sun will be sevenfold on the day when the Lord heals the injury of his people, and he will heal the pain of your wound. Isaiah 30:25–26 (LES2)

27 Behold, the name of the LORD comes from a remote place; Burning is His anger and dense is His smoke; His lips are filled with indignation And His tongue is like a consuming fire; 28 His breath is like an overflowing torrent, Which reaches to the neck, To shake the nations back and forth in a sieve, And to put in the jaws of the peoples the bridle which leads to ruin. Isaiah 30:27–28 (NASB95)

27 Look, the name of the Lord comes over time, burning wrath. The oracle of his lips is with glory; the oracle is full of anger, and the angry wrath will devour like fire. 28 And his breath, like sweeping water in a ravine, will come up to the neck and will split to trouble nations at pointless wandering; and wandering will pursue them, and it will take hold of them to their face. Isaiah 30:27–28 (LES2)

29 You will have songs as in the night when you keep the festival, And gladness of heart as when one marches to the sound of the flute, To go to the mountain of the LORD, to the Rock of Israel. 30 And the LORD will cause His voice of authority to be heard, And the descending of His arm to be seen in fierce anger, And in the flame of a consuming fire In cloudburst, downpour and hailstones. Isaiah 30:29–30 (NASB95)

29 Surely it is not the case that it is necessary for you to always be cheerful and enter into my holy places always as if observing a feast, and enter into the mountain of the Lord with the flute, as if rejoicing toward the God of Israel? 30 And the Lord will make the glory of his voice heard, even to display the wrath of his arm with wrath and anger and a devouring flame. He will thunder with violence even like water and hail carried down together with force. Isaiah 30:29–30 (LES2)

31 For at the voice of the LORD Assyria will be terrified, When He strikes with the rod. 32 And every blow of the rod of punishment, Which the LORD will lay on him, Will be with the music of tambourines and lyres; And in battles, brandishing weapons, He will fight them. 33 For Topheth has long been ready, Indeed, it has been prepared for the king. He has made it deep and large, A pyre of fire with plenty of wood; The breath of the LORD, like a torrent of brimstone, sets it afire. Isaiah 30:31–33 (NASB95)

31 For through the Lord’s voice the Assyrians will be defeated by the blow with which he strikes them. 32 And for him it will be all around, whence was their hope of aid, that he himself trusted; they will make war on him with tambourines and lyres, by way of a change. 33 For before some days you must repay. Surely it is not the case that also it was prepared for you to rule a deep ravine, piled timber, fire, and much wood? The wrath of the Lord is like a ravine burning with brimstone. Isaiah 30:31–33 (LES2)

Verse 32 is confusing in both the MT and LXX. The most interesting thing, to me, is the end of verse 32 in the LXX – “by way of a change or transition.” The MT translates this, “He will fight them.”

Verse 33 continues the confusion. The MT says, “For Topheth has long been ready, Indeed it has been prepared for the king.” The LXX says, “For before some days you must repay. Surely it is not the case that also it was prepared for you to rule a deep ravine…” I really do not know what to make of this. Brenton’s LXX translation renders the verse to mean that even though ?Assyria? thought it was her destiny to rule, that nation will encounter God’s wrath.