Bless the Lord, O house of Israel - This passage, also, is evidently an imitation of the passage in Psalm 115:9-13. The form in Ps. 115, however, is rather an exhortation to trust in the Lord, and an assurance that God would bless the classes spoken of, than a call on them to bless the Lord. Still the same classes of persons are referred to; the house of Israel; the house of Aaron; and those who feared the Lord. The passage needs no further illustration than what is found in the notes at Psalm 115:9-13. It is an earnest call on all classes of the people to bless and praise the Lord. It is language expressive of overflowing joy; the utterance of a heart full of exalted conceptions of the majesty, the glory, and the mercy of God; of a heart which feels to the utmost the fitness of praise, and desires that all classes of people - priests and people - that all created things should unite in the praise of Yahweh. Who, in reading the psalm, can fail to catch the feelings of the psalmist, and to say Amen and amen!

Bless the Lord. O house, etc. - See similar verses, Psalm 115:9-13 (note), and the notes there.

Bless the Lord, O house of Israel,.... Who are chosen by the Lord to be a special people to him above all others; redeemed from Egyptian bondage; through a variety of surprising providences brought into and settled in the land of Canaan; distinguished by various blessings, favoured with the word, worship, and ordinances of God, and not left to worship idols of gold and silver, as other nations; and therefore had great reason to bless the Lord: as also the spiritual Israel, or the household of God and of faith, the family of Christ; and that because they are of his family, because of the love of God to them, his choice of them, his covenant with them, their redemption by Christ, their effectual calling; or for being made Israelites indeed, and the provisions made for them in the house of God for their spiritual welfare;
bless the Lord, O house of Aaron: who were separated from their brethren to minister in the priest's office; to offer gifts and sacrifices for the people, and to bless them, Exodus 28:1; which was a very sacred and honourable employment, and they were under obligation to bless the Lord, who had called them to it, and put this honour on them; as are the ministers of the Gospel, who have received gifts from Christ; whom he has counted faithful, and put into the ministry; made stewards of the mysteries of his grace, and ambassadors in his stead; and especially if made useful for edification and conversion: and indeed all the Lord's people, who are all made priests unto God, and have nearness unto him, liberty and boldness to enter into the holiest of all, as Aaron once a year into the most holy place; and who have better sacrifices to offer than he, the living sacrifices of their own bodies and souls, and not slain beasts; spiritual sacrifices of prayer and praise; and, above all, the sweet smelling sacrifice of Christ they bring in the arms of faith, and so enter into the courts of God.

(Compare Psalm 115:9-11). There we have "trust" for "bless" here.

A call to the praise of Jahve, who is exalted above the gods of the nations, addressed to Israel as a whole, rounds off the Psalm by recurring to its beginning. The threefold call in Psalm 115:9-11; Psalm 118:2-4, is rendered fourfold here by the introduction of the house of the Levites, and the wishing of a blessing in Psalm 134:3 is turned into an ascription of praise. Zion, whence Jahve's self-attestation, so rich in power and loving-kindness, is spread abroad, is also to be the place whence His glorious attestation by the mouth of men is spread abroad. History has realized this.