Deuteronomy 9:15-18

So I turned and went down from the mountain while it was ablaze with fire. And the two tablets of the covenant were in my hands. When I looked, I saw that you had sinned against the LORD your God; you had made for yourselves an idol cast in the shape of a calf. You had turned aside quickly from the way that the LORD had commanded you. So I took the two tablets and threw them out of my hands, breaking them to pieces before your eyes. Then once again I fell prostrate before the LORD for forty days and forty nights; I ate no bread and drank no water, because of all the sin you had committed, doing what was evil in the LORD’s sight and so arousing his anger.