DEUT945 It is a negative commandment not to encroach beyond a neighbor's boundary, specifically in the Land of Israel as Scripture says, You shall not move your neighbor's landmark … in your inheritance which you shall inherit [this verse]--which means taking some of his land. If a person entered his neighbor's domain by even the breath of a finger, even outside the Land of Israel -- if it was by main force, he is thus a robber; if it was by stealth, he is a thief.