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 ) ( Numbers 6:23-27 ) ; 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.