Shemot 31:17-18

Orthodox Jewish Bible

¹⁷ It is an ot between Me and the Bnei Yisroel l’olam; for in sheshet yamim Hashem made Shomayim and HaAretz, and on Yom HaShevi’i He rested (shavat, ceased working), and was refreshed.

¹⁸ And He gave unto Moshe, when He had made an end of speaking with him upon Mt. Sinai, two Luchot HaEdut (Tablets of the Testimony), Luchot Even (Tablets of Stone), written with the Etzba Elohim (Finger of G-d).