The Lord tells Jeremiah to proclaim the words of this covenant to the men of Judah and the inhabitants of Jerusalem: cursed is the man who does not obey the words of the covenant I commanded your fathers when I brought them out of Egypt, from the iron furnace. If they obeyed his voice they would be his people and he their God, and he would give them the land flowing with milk and honey. Jeremiah answers: So be it, Lord.
The Lord says he warned their fathers from the start, but they did not listen or incline their ear. A conspiracy was found among the men of Judah: they turned back to the iniquities of their forefathers and went after other gods. The house of Israel and the house of Judah broke the covenant. So he will bring disaster on them that they cannot escape, and when they cry to him he will not listen. Let them cry to the gods to whom they burn incense, though those will not save them: they have as many gods as towns and as many altars as streets in Jerusalem.
God tells Jeremiah not to pray for this people or lift up a cry or prayer for them, for he will not hear. The green olive tree, beautiful with good fruit, will be burned, because the Lord himself planted it but now sets it on fire for the evil done by the house of Israel and the house of Judah.
In verses 18-23 Jeremiah learns that they want to kill him. He was like a gentle lamb led to the slaughter and did not know they were plotting against him: let us destroy the tree with its fruit, let us cut him off from the land of the living, so that his name be remembered no more. He commits his cause to the Lord, who judges righteously. The men of Anathoth sought his life and told him not to prophesy in the Lord's name or he would die by their hand. God promises to punish them: the young men will die by the sword, their sons by famine, and no remnant will be left.