Behold, bless ye the LORD, all ye servants of the LORD, which by night stand in the house of the LORD.
Servant — Peculiarly so called, priests and Levites.
Night — Not only by day, but also by night, when their watch was more necessary.
Stand — Serve or minister.
 The LORD that made heaven and earth bless thee out of Zion.
Thee — Thee whosoever thou art who dost faithfully perform the duty here commanded.