'Unity' in the Bible

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

"Will a couple walk in unity without having met?

And I shepherded the flock [doomed] to slaughter, even the afflicted of the flock. I took two staffs, one I called Kindness, and the other I called Unity, and I shepherded the flock.

And I cut asunder my second staff, Bands, to break the unity between Judah and Israel.