Deuteronomy 9:18-20

18Then I again fell down before the Lord for forty days and nights; I ate and drank nothing because of all the sin you had committed, doing such evil before the Lord as to enrage him.

19For I was terrified at the Lord’s intense anger that threatened to destroy you. But he listened to me this time as well.

20The Lord was also angry enough at Aaron to kill him, but at that time I prayed for him too.