Psalm 133

From RationalWiki

One of the Biblical Psalms, it forms a common component of Jewish Liturgy. It is generally seen as thanks for peace and companionship. "Behold, how good and how pleasant it is for brethren to dwell together in unity!"

Many secular Jews use this hymn as part of their liturgy, as the hymn, as sung, does not mention God.

The Full text, from KJV:

1 Behold, how good and how pleasant it is for brethren to dwell together in unity! 2 It is like the precious ointment upon the head, that ran down upon the beard, even Aaron's beard: that went down to the skirts of his garments; 3 As the dew of Hermon, and as the dew that descended upon the mountains of Zion: for there the LORD commanded the blessing, even life for evermore.