Psalm 133-134 (ESV)
When Brothers Dwell in Unity
A Song of Ascents. Of David.
133:1 Behold, how good and pleasant it is
when brothers dwell in unity! 
2 It is like the precious oil on the head,
running down on the beard,
on the beard of Aaron,
running down on the collar of his robes!
3 It is like the dew of Hermon,
which falls on the mountains of Zion!
For there the Lord has commanded the blessing,
Come, Bless the Lord
A Song of Ascents.
134:1 Come, bless the Lord, all you servants of the Lord,
who stand by night in the house of the Lord!
2 Lift up your hands to the holy place
and bless the Lord!
3 May the Lord bless you from Zion,
he who made heaven and earth!