Exodus 19:11-13

Young's Literal Translation

¹¹ and have been prepared for the third day; for on the third day doth Jehovah come down before the eyes of all the people, on mount Sinai.

¹² `And thou hast made a border [for] the people round about, saying, Take heed to yourselves, going up into the mount, or coming against its extremity; whoever is coming against the mount is certainly put to death;

¹³ a hand cometh not against him, for he is certainly stoned or shot through, whether beast or man it liveth not; in the drawing out of the jubilee cornet they go up into the mount.'