Shemot 19:18-20 Orthodox Jewish Bible (OJB)
18 And Mt. Sinai was altogether smoking, because Hashem descended upon it in eish; and the smoke thereof ascended as the smoke of the furnace, and kol HaHar shook violently.
19 And when the sound of the shofar was moving [closer], and grew louder and louder, Moshe spoke, and HaElohim answered him in thunder.
20 And Hashem came down upon Mt. Sinai, onto the top of HaHar; and Hashem summoned Moshe up to the top of HaHar; and Moshe went up.