Deuteronomy 9:18-20

18I fell down like the first time in the presence of the Lord for forty days and forty nights; I did not eat food or drink water because of all the sin you committed, doing what was evil in the Lord’s sight and angering him.

19I was afraid of the fierce anger the Lord had directed against you, because he was about to destroy you. But again the Lord listened to me on that occasion.

20The Lord was angry enough with Aaron to destroy him. But I prayed for Aaron at that time also.