Exodus 34:27-29

Young's Literal Translation

²⁷ And Jehovah saith unto Moses, `Write for thyself these words, for, according to the tenor of these words I have made with thee a covenant, and with Israel.'

²⁸ And he is there with Jehovah forty days and forty nights; bread he hath not eaten, and water he hath not drunk; and he writeth on the tables the matters of the covenant -- the ten matters.

²⁹ And it cometh to pass, when Moses is coming down from mount Sinai (and the two tables of the testimony [are] in the hand of Moses in his coming down from the mount), that Moses hath not known that the skin of his face hath shone in His speaking with him,