Deuteronomy 9:18-20

18“Then, as before, I threw myself down before the Lord for forty days and nights. I ate no bread and drank no water because of the great sin you had committed by doing what the Lord hated, provoking him to anger.

19I feared that the furious anger of the Lord, which turned him against you, would drive him to destroy you. But again he listened to me.

20The Lord was so angry with Aaron that he wanted to destroy him, too. But I prayed for Aaron, and the Lord spared him.