Mark 3:24

if a kingdom be divided against it self, that kingdom cannot last.

John 17:21

that they all may be one, as thou, father, art in me, and I in thee; that they also may be one in us: that the world may believe that thou hast sent me.

1 Corinthians 1:10-13

Now I beseech you, brethren, by the name of our Lord Jesus Christ, to maintain all the same doctrine, to suffer no divisions among you; but to be perfectly united in the same mind, and in the same judgment.

Ephesians 4:3-6

endeavouring to preserve the spiritual union by your affectionate attachment to one another.

Treasury of Scripture Knowledge

Summary

And if a kingdom be divided against itself, that kingdom cannot stand.

Bible References

General references

John 17:21
that they all may be one, as thou, father, art in me, and I in thee; that they also may be one in us: that the world may believe that thou hast sent me.
1 Corinthians 1:10
Now I beseech you, brethren, by the name of our Lord Jesus Christ, to maintain all the same doctrine, to suffer no divisions among you; but to be perfectly united in the same mind, and in the same judgment.
Ephesians 4:3
endeavouring to preserve the spiritual union by your affectionate attachment to one another.