4 Bible Verses about Harmony

Do two men walk together unless they have made an appointment?

Behold, how good and how pleasant it is
For brothers to dwell together in unity!

that they all may be one; just as You, Father, are in Me and I in You, that they also may be one in Us, so that the world may believe [without any doubt] that You sent Me.

Do not be unequally bound together with unbelievers [do not make mismatched alliances with them, inconsistent with your faith]. For what partnership can righteousness have with lawlessness? Or what fellowship can light have with darkness?