Matthew Poole's Commentary
A Song of degrees. Behold, bless ye the LORD, all ye servants of the LORD, which by night stand in the house of the LORD.THE ARGUMENT
The form of this Psalm seems to be dramatical. In the two first verses the psalmist speaks in the name of some emminent person, either the king or chief priests, exhorting and requiring all the priests and Levites to perform the duties of their place and calling; and in the last verse in the name of the priests and Levites, returning him thanks for his good advice.
The priests and Levites are exhorted to bless the Lord in his sanctuary.
Behold, bless ye the Lord; do not stand there like statues, dumb and idle, but employ your hearts and tongues in singing forth the praises of the Lord.
Ye servants of the Lord; peculiarly so called, priests and Levites, who are set apart to the service of God and of the sanctuary, as the next clause restrains this general expression. By night; not only by day, but also and especially by night, when their watch was more necessary. See Exodus 27:21 Leviticus 8:35 1 Samuel 3:3. As you watch by night when others sleep, so do you utter the praises of God when others are silent.
Stand, i.e. serve or minister, as this word is used, Deu 10:8 18:7, and oft elsewhere. House; which word includes both the temple and courts belonging to it, as hath been noted before.
Lift up your hands in the sanctuary, and bless the LORD.Lift up your hands unto God in prayer and praises, thus expressing and exciting your inward devotion. In the sanctuary; in that holy house of God Where you stand, Psalm 134:1. Or, in or with holiness, lift up your hands, as it is prescribed, 1 Timothy 2:8. Do not content yourselves with lifting up your hands, but see that this be done with pure and holy hearts.
The LORD that made heaven and earth bless thee out of Zion.Thee; either,
1. Thee, whosoever thou art, who dost faithfully perform the duty here commanded. Or,
2. Thee, O king, or priest, who dost engage and encourage us in this blessed work.
Out of Zion; where God dwells, and from whence he heareth the prayers of his people, and giveth them the blessings which they desire and need.