Deuteronomy 4:12-14

12Then the LORD spoke to you out of the fire. You heard the sound of words but saw no form; there was only a voice. 13He declared to you his covenant, the Ten Commandments, which he commanded you to follow and then wrote them on two stone tablets.

14And the LORD directed me at that time to teach you the decrees and laws you are to follow in the land that you are crossing the Jordan to possess.