Exodus 31:17-18

Darby Translation

¹⁷ It shall be a sign between me and the children of Israel for ever; for [in] six days Jehovah made the heavens and the earth, and on the seventh day he rested, and was refreshed.

¹⁸ And he gave to Moses, when he had ended speaking with him on mount Sinai, the two tables of testimony, tables of stone, written with the finger of God.