Exodus 19:12
And you shall set bounds unto the people round about, saying, Take heed to yourselves, go up into the mount, or touch the border of it: whosoever toucheth the mount shall be surely put to death:
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Context
10 And the Yahuah said unto Moses, Go unto the people, and sanctify them to day and to morrow, and let them wash their clothes,
11 And be ready against the third day: for the third day the Yahuah will come down in the sight of all the people upon mount Sinai.
12 And you shall set bounds unto the people round about, saying, Take heed to yourselves, go up into the mount, or touch the border of it: whosoever toucheth the mount shall be surely put to death:
13 There shall not an hand touch it, but he shall surely be stoned, or shot through; whether beast or man, it shall not live: when the trumpet soundeth long, they shall come up to the mount.
14 And Moses went down from the mount unto the people, and sanctified the people; and they washed their clothes.