it. him: i.e. not arrested or seized lest trespass on mount incurred.
surely be stoned. Figure of speech Polyptoton (App-6). Compare Genesis 26:28.
Related Commentaries of Exodus 19:13
Exodus 19:13
13 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 trumpeta soundeth long, they shall come up to the mount.