Deuteronomy 4:11-15

11And ye came near and stood under the mountain; and the mountain burned with fire to the heart of heaven, with darkness, clouds, and obscurity.

12And Jehovah spoke to you from the midst of the fire: ye heard the voice of the words, but ye saw no form; only [ye heard] a voice.

13And he declared to you his covenant, which he commanded you to do, the ten words; and he wrote them on two tables of stone.

14And Jehovah commanded me at that time to teach you statutes and ordinances, that ye might do them in the land whither ye are passing over to possess it.

15And take great heed to your souls (for ye saw no form on the day that Jehovah spoke to you in Horeb from the midst of the fire),