Exodus 19:13 - Clarke's commentary and critical notes on the Bible

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. There shall not a hand touch it - בו bo, Him, not the mountain, but the man who had presumed to touch the mountain. He should be considered altogether as an unclean and accursed thing, not to be touched for fear of conveying defilement; but should be immediately stoned or pierced through with a dart, Hebrews 12:20.