Ephesians 4:4 (ESV)
There is one body and one Spirit—just as you were called to the one hope that belongs to your call—
Ephesians 4:15-16 (ESV)
Rather, speaking the truth in love, we are to grow up in every way into him who is the head, into Christ, from whom the whole body, joined and held together by every joint with which it is equipped, when each part is working properly, makes the body grow so that it builds itself up in love.
Psalm 133:1 (ESV)
Behold, how good and pleasant it is when brothers dwell in unity!