20 Go, my people, enter your rooms and shut the doors behind you; hide yourselves for a little while until his wrath has passed by.
6 Seek the Lord and live, or he will sweep through the tribes of Joseph like a fire; it will devour them, and Bethel will have no one to quench it.
(Read Amos 5:1-6)
The convincing, awakening word must be heard and heeded, as well as words of comfort and peace; for whether we hear or forbear, the word of God shall take effect. The Lord still proclaims mercy to men, but they often expect deliverance from such self-invented forms as make their condemnation sure. While they refuse to come to Christ and to seek mercy in and by him, that they may live, the fire of Divine wrath breaks forth upon them. Men may make an idol of the world, but will find it cannot protect.
Matthew Henry's Commentary on Isaiah 26:20
Commentary on Isaiah 26:20-21
(Read Isaiah 26:20-21)
When dangers threaten, it is good to retire and lie hid; when we commend ourselves to God to hide us, he will hide us either under heaven or in heaven. Thus we shall be safe and happy in the midst of tribulations. It is but for a short time, as it were for a little moment; when over, it will seem as nothing. God's place is the mercy-seat; there he delights to be: when he punishes, he comes out of his place, for he has no pleasure in the death of sinners. But there is hardly any truth more frequently repeated in Scripture, than God's determined purpose to punish the workers of iniquity. Let us keep close to the Lord, and separate from the world; and let us seek comfort in secret prayer. A day of vengeance is coming on the world, and before it comes we are to expect tribulation and suffering. But because the Christian looks for these things, shall he be restless and dismayed? No, let him repose himself in his God. Abiding in him, the believer is safe. And let us wait patiently the fulfilling of God's promises.