Deuteronomy 9:18-20

18And I fell down before the Lord, as at the first, forty days and forty nights; I neither ate bread nor drank water, because of all your sin which you committed in doing wickedly in the sight of the Lord, to provoke Him to anger.

19For I was afraid of the anger and hot displeasure with which the Lord was angry with you, to destroy you. But the Lord listened to me at that time also.

20And the Lord was very angry with Aaron and would have destroyed him; so I prayed for Aaron also at the same time.