There are more bible verses about borders and protecting borders than one might think.
Deuteronomy 27:17a “Cursed be he that removeth his neighbour’s landmark.”
Deuteronomy 19:14a “Thou shalt not remove thy neighbour’s landmark, which they of old time have set in thine inheritance”.
Proverbs 23:10 “Remove not the old landmark; and enter not into the fields of the fatherless”.
Deuteronomy 32:8 “When the most High divided to the nations their inheritance, when he separated the sons of Adam, he set the bounds of the people according to the number of the children of Israel.”
God created borders and insisted that borders be respected. An inheritance is a personal belonging. If someone comes along and steals that inheritance they are a robber and a thief. When someone sneaks across a border they are a robber and a thief according to God’s Law. A person who aids people in this sin share in the guilt of all that the people he helps do. There is more to this in God’s Law.
Acts 17:26 “And hath made of one blood all nations of men for to dwell on all the face of the earth, and hath determined the times before appointed, and the bounds of their habitation”.
2 Corinthians 6:17a “Wherefore come out from among them, and be ye separate (to set off by boundary), saith the Lord”.