Contradiction with Matthew 22:39
Contradicts by emphasizing love for neighbor, while Numbers 34:23 is focused on territorial allocation.
Matthew 22:39: On these two commandments hang all the law and the prophets.
Contradiction with Matthew 5:9
Contradicts by promoting peace-making, whereas the context of Numbers 34:23 involves division and allocation which could imply conflict.
Matthew 5:9: Blessed [are] the peacemakers: for they shall be called the children of God.
Contradiction with Romans 12:18
Contradicts by advocating living peacefully with all men, in contrast to the division taught in Numbers 34:23.
Romans 12:18: If it be possible, as much as lieth in you, live peaceably with all men.
Contradiction with 1 Corinthians 14:33
Contradicts by claiming God is not a God of confusion, whereas territorial division might foster confusion or dispute.
1 Corinthians 14:33: For God is not [the author] of confusion, but of peace, as in all churches of the saints. [confusion: Gr. tumult, or, unquietness]