"You shall not move back your neighbor's boundary marker"—Deuteronomy 19:14.
It is forbidden to tamper with a boundary marker separating two parcels of land, so as to claim part of a neighbor's property. One who does so has violated this Torah injunction—in addition to being guilty of theft.
This commandment only applies in the land of Israel. Outside of Israel, one who tampers with a land marker is only guilty of transgressing the generic prohibition against theft.
"Do not steal"—Exodus 20:13.
It is forbidden to abduct one's fellow.
