Deuteronomy 9:9, 18

When I went up to the mountain to receive the tablets of stone, the tablets of the covenant which the LORD had made with you, then I remained on the mountain forty days and nights; I neither ate bread nor drank water.

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