Mark 3:24

When a kingdom is divided against itself, it cannot last;

John 17:21

That they all may be one--that as thou, Father, art in union with us--and so the world may believe that thou hast sent me as thy Messenger.

1 Corinthians 1:10-13

But I appeal to you, Brothers, by the Name of our Lord Jesus Christ, to agree in what you profess, and not to allow divisions to exist among you, but to be united-of one mind and of one opinion.

Ephesians 4:3-6

And striving to maintain in the bond of peace the unity given by the Spirit.

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--that as thou, Father, art in union with us--and so the world may believe that thou hast sent me as thy Messenger.
1 Corinthians 1:10
But I appeal to you, Brothers, by the Name of our Lord Jesus Christ, to agree in what you profess, and not to allow divisions to exist among you, but to be united-of one mind and of one opinion.
Ephesians 4:3
And striving to maintain in the bond of peace the unity given by the Spirit.