Luke 11:17
But he(Jesus), knowing their thoughts, said to them, “Every kingdom divided against itself is laid waste, and a divided household falls.
Romans 16:17-18
I appeal to you, brothers, to watch out for those who cause divisions and create obstacles contrary to the doctrine that you have been taught; avoid them. For such persons do not serve our Lord Christ, but their own appetites, and by smooth talk and flattery they deceive the hearts of the naive.
1 Corinthians 1:10-13
I appeal to you, brothers, by the name of our Lord Jesus Christ, that all of you agree, and that there be no divisions among you, but that you be united in the same mind and the same judgment.
and on and on anon :}