Exodus 19:12-14

Young's Literal Translation

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.'

¹⁴ And Moses cometh down from the mount unto the people, and sanctifieth the people, and they wash their garments;