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 sins which ye sinned, 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 hearkened to me at that time also. 20And the LORD was very angry with Aaron to have destroyed him: and I prayed for Aaron also at the same time.