Exodus 19:12-14

And thou shalt set bounds unto the people round about, saying, Take heed to yourselves, {that ye} go {not} up into the mount, or touch the border of it: whosoever toucheth the mount shall be surely put to death: There shall not an hand touch it, but he shall surely be stoned, or shot through; whether {it be} beast or man, it shall not live: when the trumpet soundeth long, they shall come up to the mount. {trumpet: or, cornet} And Moses went down from the mount unto the people, and sanctified the people; and they washed their clothes.