Deuteronomy 4:14 WEB

¹²  Yahweh spoke to you out of the midst of the fire: you heard the voice of words, but you saw no form; only [you heard] a voice.

¹³  He declared to you his covenant, which he commanded you to perform, even the ten commandments; and he wrote them on two tables of stone.

¹⁴  Yahweh commanded me at that time to teach you statutes and ordinances, that you might do them in the land where you go over to possess it.

¹⁵  Take therefore good heed to yourselves; for you saw no manner of form on the day that Yahweh spoke to you in Horeb out of the midst of the fire.

¹⁶  Lest you corrupt yourselves, and make yourself an engraved image in the form of any figure, the likeness of male or female,