Exodus 34:27-29 Common English Bible (CEB)
27 The Lord said to Moses: “Write down these words because by these words I hereby make a covenant with you and with Israel.” 28 Moses was there with the Lord forty days and forty nights. He didn’t eat any bread or drink any water. He wrote on the tablets the words of the covenant, the ten words.
Moses’ brightly shining face
29 Moses came down from Mount Sinai. As he came down from the mountain with the two covenant tablets in his hand, Moses didn’t realize that the skin of his face shone brightly because he had been talking with God.