" A Song of Ascents. Of David. Behold, how good and pleasant it is when brothers dwell in unity!"
Psalm 133:1
See: Notes on Psalms by Thomas L. Constable
Publisher: Constable's Bible Study Notes
See Sermon: Christian Unity Is a Precious Gift: Psalm 133:2 by John Piper
Publisher: Bethlehem Baptist Church
Info from GetContent.xyz