Moses tells Israel they are about to cross the Jordan to dispossess nations greater and stronger than they, with cities fortified up to heaven and giant Anakim. But the Lord will go ahead as a consuming fire and subdue them. Israel must not say in their heart that the Lord brought them in because of their righteousness: it is because of the wickedness of those nations and the oath made to Abraham, Isaac and Jacob. Moses says it plainly: Israel is a stiff-necked people.
To prove it, he reviews their history. At Horeb they provoked the Lord to anger. Moses went up the mountain for forty days and forty nights, without eating bread or drinking water, to receive the tablets written by the finger of God. There the Lord told him to go down, because the people had corrupted themselves by making a molten calf. Moses went down, saw the sin and broke the two tablets before their eyes.
He fell down again for forty days and forty nights, without eating or drinking, because of the people's sin. The Lord was also angry with Aaron enough to destroy him, and Moses prayed for him. He took the calf, burned it, ground it to dust and threw it into the brook that came down from the mountain. Moses adds other rebellions: at Taberah, at Massah, at Kibroth-hattaavah and at Kadesh-barnea.
The chapter ends with Moses' prayer. He asks the Lord not to destroy his people and his inheritance, to remember his servants Abraham, Isaac and Jacob and not look at the people's stubbornness, so that the Egyptians would not say the Lord was not able to bring them into the land. They are his people and his inheritance, whom he brought out by great power and an outstretched arm.