Exodus 34:28 in the King James Version
And he was there with the LORD forty days and forty nights; he did neither eat bread, nor drink water. And he wrote upon the tables the words of the covenant, the ten commandments.
Context
27 The LORD said to Moses, “Write these words; for in accordance with these words I have made a covenant with you and with Israel.”
28 He was there with the LORD forty days and forty nights; he neither ate bread, nor drank water. He wrote on the tablets the words of the covenant, the ten commandments.
29 When Moses came down from Mount Sinai with the two tablets of the covenant in Moses’ hand, when he came down from the mountain, Moses didn’t know that the skin of his face shone by reason of his speaking with him.