v1: Israel enjoyed a special privilege of being God's people; created and formed, redeemed and named; they belonged to God; the same verbs are used as in 42.5 of the earth. Although the privilege is great, so is the responsibility. The message here is 'do not fear,' which is repeated. Those who belong to God are His.
v2: Preservation; past and future; God's faithfulness and presence manifest yesterday and tomorrow. Doubtless Isaiah's hearers would recall the deliverance through the Red Sea; we also recall the deliverance of Shadrach, Meshach, and Abednego through the furnace (Dan 3). However, God's people will always experience the floods and furnaces of this world, attacks from the enemy which threaten to sweep us away or scorch us.
v3: God is Saviour; He ransomed the people, Ex 20.3. This implies a price, as well as ownership. He gave nations up to desolation, that He might deliver His own.
v4: Since the nation was delivered by God, they are set apart as His people.
v5-7: Israel, now scattered, will be regathered, for the declaration of God's power and glory. Future promises are as certain as past events, as in v2. Since God knows all who are His, He will gather every one. These words also pre-figure the gathering of all nations to Christ. Geography, distance, prove useless, as God will draw His own to Himself.
v8-9: Israel was called by God; and all the nations will be gathered to see and hear the testimony of God's witness, Israel. The blind and deaf, see 42.18.
v10: The witness, declaring that he knows God.
v11: The witness declares the uniqueness of God.
v12: God insists that His witness has a walk of loyalty; he must reject idolatry.
v13: God is omnipotent; He can do anything. The idol, in contrast, is impotent.
v14-15: Israel is not totally forsaken. The Lord predicted the future exile in Babylon, and also the deliverance of the people from Babylon. He always remains the Redeemer, and the people are always His. Just as God had delivered the people from Egypt, so He would deliver them from Babylon.
v16-18: See Ps 77.19; the same God who delivered His people through the Red Sea, will once more deliver them. Yet He also says, "Forget the former things," for He has new things to do on behalf of His people.
v19-20: See 41.18-19; God's "new thing" declared. When it occurs, it is clear proof that it is the work of God. "Water in the desert...streams in the wilderness;" sufficient for His people; here is something virtually impossible, it must be God's work.
v21: The people to declare His praise; His works are on behalf of His people; and their life is in Him, and for Him; 1 Pet 2.9. We may not be able to add to His glory, but we can exalt His glory. He cannot be esteemed more highly in Heaven, but He can be esteemed more highly on earth.
v22-24: The charge against Israel; in spite of God's blessings, the nation had been unfaithful. The promise of glories to come is tempered with a reminder of the people's unfaithfulness.
v25-28: Although Israel had been unfaithful, God had remained faithful; He would blot out their sins. Although Israel would also suffer for her sins.