Shemot 19:19-21

Orthodox Jewish Bible

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.

²¹ And Hashem said unto Moshe, Go down, warn HaAm, lest they push through toward Hashem to gaze, and many of them fall perishing.