Mark 3:24

If a kingdom is disunited, that kingdom cannot last.

John 17:21

for them all to be one, just as you, Father, are in union with me and I in union with you, for them to be in union with us, so that the world may be convinced that you have sent me.

1 Corinthians 1:10-13

Now I beg you all, brothers, for the sake of our Lord Jesus Christ, to be harmonious in what you say and not to have factions among you, but to be perfectly harmonious in your minds and judgments.

Ephesians 4:3-6

continuing with eager earnestness to maintain the unity of the Spirit through the tie of peace.

Treasury of Scripture Knowledge

Summary

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

Bible References

General references

John 17:21
for them all to be one, just as you, Father, are in union with me and I in union with you, for them to be in union with us, so that the world may be convinced that you have sent me.
1 Corinthians 1:10
Now I beg you all, brothers, for the sake of our Lord Jesus Christ, to be harmonious in what you say and not to have factions among you, but to be perfectly harmonious in your minds and judgments.
Ephesians 4:3
continuing with eager earnestness to maintain the unity of the Spirit through the tie of peace.