4 Bible Verses about Harmony

May twain walk together except they be agreed among themselves?

{A song of the stairs} Behold, how good and joyful a thing it is, brethren, to dwell together in unity!

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

Set yourselves therefore at large, and bear not a stranger's yoke with the unbelievers. For what fellowship hath righteousness with unrighteousness? What company hath light with darkness?