The chapter begins with a short, powerful sentence: on that day the Lord will punish with his hard, great and strong sword Leviathan the fleeing serpent, Leviathan the twisting serpent, and will slay the dragon that is in the sea. It is a picture of organized evil and chaos, defeated by God.
On that day a song will be sung about a pleasant vineyard. The Lord himself keeps it, waters it every moment and guards it night and day so that no one will harm it. He has no wrath against it; if there are thorns and briers, he will march against them, unless they take hold of his protection and make peace with him. In days to come Jacob will take root, Israel will blossom and fill the face of the world with fruit.
Verses 7-11 reflect on Israel's punishment: the Lord has not struck them as he struck those who struck them, but with measure. The atonement of Jacob's guilt and the fruit of removing his sin appear in the altar stones being ground to powder and no Asherah poles or incense altars left standing. The fortified city is left desolate, because the people lacked understanding. At the end, the Lord will thresh from the Euphrates to the Brook of Egypt, and the children of Israel will be gathered one by one. A great trumpet will sound, and those lost in Assyria and those scattered in Egypt will come and worship the Lord on the holy mountain at Jerusalem.