Psalm 134:1
134:1 A Song of degrees. Behold, bless ye the LORD, all [ye]
      {a} servants of the LORD, which by night stand in the
      house of the LORD.

      (a) You who are Levites and chiefly appointed to this
          office.

Psalm 134:2
134:2 Lift up your {b} hands [in] the sanctuary, and bless the
      LORD.

      (b) For their charge was not only to keep the temple, but
          to pray there and to give God thanks.

Psalm 134:3
134:3 The LORD that {c} made heaven and earth bless thee out of
      Zion.

      (c) And therefore has all power, bless you with his
          fatherly love declared in Zion. Thus the Levites used
          to praise the Lord, and bless the people.