Psalm 134: Ecce nunc
Book of Common Prayer (1979), page 787. In the 30-day Psalter it is read on day 28, at Morning Prayer.
1
Behold now, bless the LORD, all you servants of the LORD, *
you that stand by night in the house of the LORD.
2
Lift up your hands in the holy place and bless the LORD; *
the LORD who made heaven and earth bless you out of Zion.