Exodus Chapter 19, Verse 12
From BibleWiki
12: 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:
12: And thou shalt appoint certain limits to the people round about,
and thou shalt say to them: Take heed ye go not up into the mount, and
that ye touch not the borders thereof: every one that toucheth the
mount, dying he shall die.
12: And thou shalt separate the people round about, saying, Take heed to yourselves that ye go not up into the mountain, nor touch any part of it: every one that touches the mountain shall surely die.
Exodus Chapter 19, Verse 12/commentary

