Deuteronomy 4:10-13

10Specially the day that thou stoodest before Yhwh thy God in Horeb, when Yhwh said unto me, Gather me the people together, and I will make them hear my words, that they may learn to fear me all the days that they shall live upon the earth, and that they may teach their children.

11And ye came near and stood under the mountain; and the mountain burned with fire unto the midst of heaven, with darkness, clouds, and thick darkness.1

12And Yhwh spake unto you out of the midst of the fire: ye heard the voice of the words, but saw no similitude; only ye heard a voice.2

13And he declared unto you his covenant, which he commanded you to perform, even ten commandments; and he wrote them upon two tables of stone.