Deuteronomy 9:16-20

And I looked, and, behold, ye had sinned against the LORD your God, and had made you a molten calf: ye had turned aside quickly out of the way which the LORD had commanded you.

And I took the two tables, and cast them out of my two hands, and brake them before your eyes.

And I fell down before the LORD, as at the first, forty days and forty nights: I did neither eat bread, nor drink water, because of all your sins which ye sinned, in doing wickedly in the sight of the LORD, to provoke him to anger.

For I was afraid of the anger and hot displeasure, wherewith the LORD was wroth against you to destroy you. But the LORD hearkened unto me at that time also.

And the LORD was very angry with Aaron to have destroyed him: and I prayed for Aaron also the same time.