Here is, 1. The duty we are called to - to praise the Lord, to praise his name; praise him, and again praise him. We must not only thank him for what he has done for us, but praise him for what he is in himself and has done for others; take all occasions to speak well of God and to give his truths and ways a good word. 2. The persons that are called upon to do this - the servants of the Lord, the priests and Levites that stand in his house, and all the devout and pious Israelites that stand in the courts of his house to worship there, Psa 135:2. Those that have most reason to praise God who are admitted to the privileges of his house, and those see most reason who there behold his beauty and taste his bounty; from them it is expected, for to that end they enjoy their places. Who should praise him if they do not? 3. The reasons why we should praise God. (1.) Because he whom we are to praise is good, and goodness is that which every body will speak well of. He is good to all, and we must give him the praise of that. His goodness is his glory, and we must make mention of it to his glory. (2.) Because the work is its own wages: Sing praises to his name, for it is pleasant. It is best done with a cheerful spirit, and we shall have the pleasure of having done our duty. It is a heaven upon earth to be praising God; and the pleasure of that should quite put our mouths out of taste for the pleasures of sin. (3.) Because of the peculiar privileges of God's people (Psa 135:4): The Lord hath chosen Jacob to himself, and therefore Jacob is bound to praise him; for therefore God chose a people to himself that they might be unto him for a name and a praise (Jer 13:11), and therefore Jacob has abundant matter for praise, being thus dignified and distinguished. Israel is God's peculiar treasure above all people (Exo 19:5); they are his Segullah, a people appropriated to him, and that he has a delight in, precious in his sight and honourable. For this distinguishing surprising favour, if the seed of Jacob do not praise him, they are the most unworthy ungrateful people under the sun.

Praise ye the Lord,.... Or hallelujah; which may be considered as the title of the psalm; as in the Targum, Septuagint, Vulgate Latin, Ethiopic, and Arabic versions:

praise ye the name of the Lord; that is, the Lord himself, and the perfections of his nature; his greatness, goodness, grace, and mercy; his holiness, justice, power, truth, and faithfulness; and also his word, by which he makes known himself, and is a distinguishing blessing to his people, and to be praised for it; see Psa 48:1;

praise him, O ye servants of the Lord; priests and Levites, and ministers of the word, and all the people of God; who once were the servants of sin, Satan, and the world, but now by the grace of God become his servants; see Rom 6:17. Some observe that the word praise is here used three times, which is thought not to be without a mystery; and may have regard to the three divine Persons in the Godhead, who are each to be praised; the Father for electing grace, the Son for redeeming grace, and the Spirit for regenerating and sanctifying grace.