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.

Philippians 2:2-5

fill up my cup of joy by living in harmony, by fostering the same disposition of love, your hearts beating in unison, your minds set on one purpose.

Hebrews 13:1

You must let your brotherly love continue.

John 13:35

By this everybody will know that you are my disciples, if you keep on showing love for one another."

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 Peter 3:8

Finally, you must all live in harmony, be sympathetic, loving as brothers, tenderhearted, humble,

Ephesians 4:3-6

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

1 John 3:14-19

We know that we have passed out of death into life, because we love our brothers. Whoever does not continue to love continues still in death.

Treasury of Scripture Knowledge

Summary

{A Song of degrees of David.} Behold, how good and how pleasant it is for brethren to dwell together in unity!

General references

Bible References

How good

John 13:35
By this everybody will know that you are my disciples, if you keep on showing love for one another."
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.
Philippians 2:2
fill up my cup of joy by living in harmony, by fostering the same disposition of love, your hearts beating in unison, your minds set on one purpose.
Hebrews 13:1
You must let your brotherly love continue.
1 Peter 3:8
Finally, you must all live in harmony, be sympathetic, loving as brothers, tenderhearted, humble,
1 John 3:14
We know that we have passed out of death into life, because we love our brothers. Whoever does not continue to love continues still in death.

General references

Mark 3:25
And if a household is disunited, that household cannot last.