When Moses does not return when expected from Mount Sinai, the people make a golden calf and worship it. G-d proposes to destroy the errant nation, but Moses intercedes on their behalf. Moses descends from the mountain carrying the tablets of the testimony engraved with the Ten Commandments; seeing the people dancing about their idol, he breaks the tablets, destroys the golden calf, and has the primary culprits put to death. He then returns to G-d to say: "If You do not forgive them, blot me out from the book that You have written."

G-d forgives, but says that the effect of their sin will be felt for many generations. At first G-d proposes to send His angel along with them, but Moses insists that G-d Himself accompany His people to the promised land.

Moses prepares a new set of tablets and once more ascends the mountain, where G-d reinscribes the covenant on these second tablets. On the mountain, Moses is also granted a vision of the divine thirteen attributes of mercy. So radiant is Moses' face upon his return, that he must cover it with a veil, which he removes only to speak with G-d and to teach His laws to the people.