1 Corinthians 1:10

Now, I beseech you, brethren, by the name of our Lord Jesus Christ, that you all speak the same thing, and that there be no schisms among you, but that you be perfectly united in the same mind, and in the same judgment.

Philippians 2:2-5

fulfill my joy, that you be of the same mind, having the same love, of one soul, of one mind;

Hebrews 13:1

Let brotherly love continue.

John 13:35

By this shall all men know that you are my disciples, if you have love one for another.

John 17:21

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

1 Peter 3:8

Finally, be all of the same mind, be sympathizing, lovers of the brethren, kind-hearted, humble-minded;

Ephesians 4:3-6

earnestly endeavoring to keep the unity of the Spirit in the bond of peace.

1 John 3:14-19

We know that we have passed from death to life, because we love the brethren: he that loves not his brother, abides 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 shall all men know that you are my disciples, if you have love one for another.
John 17:21
that they all may be one, as thou, Father, art in me, and I in thee, that they 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, that you all speak the same thing, and that there be no schisms among you, but that you be perfectly united in the same mind, and in the same judgment.
Ephesians 4:3
earnestly endeavoring to keep the unity of the Spirit in the bond of peace.
Philippians 2:2
fulfill my joy, that you be of the same mind, having the same love, of one soul, of one mind;
Hebrews 13:1
Let brotherly love continue.
1 Peter 3:8
Finally, be all of the same mind, be sympathizing, lovers of the brethren, kind-hearted, humble-minded;
1 John 3:14
We know that we have passed from death to life, because we love the brethren: he that loves not his brother, abides in death.

General references

Mark 3:25
And if a house be divided against itself, that house can not stand.