Exodus 31:18 BBE

¹⁶  And the children of Israel are to keep the Sabbath holy, from generation to generation, by an eternal agreement.

¹⁷  It is a sign between me and the children of Israel for ever; because in six days the Lord made heaven and earth, and on the seventh day he took his rest and had pleasure in it.

¹⁸  And when his talk with Moses on Mount Sinai was ended, he gave him the two stones of the law, two stones on which was the writing made by the finger of God.