Deuteronomy 9:18-20

18Then, as before, I fell down before the Lord for [another] forty days and forty nights; I did not eat food or drink water, because of all the sin you had committed by doing what was evil in the sight of the Lord to provoke Him to anger.

19For I was afraid of the anger and absolute fury which the Lord held against you, [enough divine fury] to destroy you, but the Lord listened to me that time also.

20The Lord was very angry with Aaron, angry [enough] to destroy him, so I also prayed for Aaron at the same time.