Exodus 19:15

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;

15 and he saith unto the people, `Be ye prepared for the third day, come not nigh unto a woman.`

16 And it cometh to pass, on the third day, while it is morning, that there are voices, and lightnings, and a heavy cloud, on the mount, and the sound of a trumpet very strong; and all the people who [are] in the camp do tremble.

17 And Moses bringeth out the people to meet God from the camp, and they station themselves at the lower part of the mount,

18 and mount Sinai [is] wholly a smoke from the presence of Jehovah, who hath come down on it in fire, and its smoke goeth up as smoke of the furnace, and the whole mount trembleth exceedingly;