This is the second part of this evangelical song, and to the same purport with the former; there believers stir up themselves to praise God, here they invite and encourage one another to do it, and are contriving to spread his praise and draw in others to join with them in it. Observe,

I.Who are here called upon to praise God - the inhabitants of Zion and Jerusalem, whom God had in a particular manner protected from Sennacherib's violence, Isa 12:6. Those that have received distinguishing favours from God ought to be most forward and zealous in praising him. The gospel church is Zion. Christ is Zion's King. Those that have a place and a name in the church should lay out themselves to diffuse the knowledge of Christ and to bring many to him. Thou inhabitress of Zion; the word is feminine. Let the weaker sex be strong in the Lord, and out of their mouth praise shall be perfected.

II.How they must praise the Lord. 1. By prayer: Call upon his name. As giving thanks for former mercy is a decent way of begging further mercy, so begging further mercy is graciously accepted as a thankful acknowledgment of the mercies we have received. In calling upon God's name we give unto him some of the glory that is due to his name as our powerful and bountiful benefactor. 2. By preaching and writing. We must not only speak to God, but speak to others concerning him, not only call upon his name, but (as the margin reads it) proclaim his name; let others know something more from us than they did before concerning God, and those things whereby he has made himself known. Declare his doings, his counsels (so some read it); the work of redemption is according to the counsel of his will, and in that and other wonderful works that he has done we must take notice of his thoughts which are to us-ward, Psa 40:5. Declare these among the people, among the heathen, that they may be brought into communion with Israel and the God of Israel. When the apostles preached the gospel to all nations, beginning at Jerusalem, then this scripture was fulfilled, that his doings should be declared among the people and that what he has done should be known in all the earth. 3. By a holy exultation and transport of joy: "Cry out and shout; welcome the gospel to yourselves and publish it to others with huzzas and loud acclamations, as those that shout for victory (Exo 32:18) or for the coronation of a king," Num 23:21.

III.For what they must praise the Lord. 1. Because he has glorified himself. Remember it yourselves, and make mention of it to others, that his name is exalted, has become more illustrious and more conspicuous; in this every good man rejoices. 2. Because he has magnified his people: He has done excellent things for them, which make them look great and considerable. 3. Because he is, and will be, great among them: Great is the Holy One, for he is glorious in holiness; therefore great, because holy. True goodness is true greatness. He is great as the Holy One of Israel, and in the midst of them, praised by them (Psa 76:1), manifesting himself among them, and appearing gloriously in their behalf. It is the honour and happiness of Israel that the God who is in covenant with them, and in the midst of them, is infinitely great.

In that day shall ye say, praise the Lord,.... On account of his being and perfections, for blessings received from him, especially spiritual ones; and particularly such as are before mentioned, fulness of grace in him, strength and salvation by him, a view of interest in him as a Saviour, and divine comforts communicated from him; which is done by giving him the glory of them, and thanks for them. This is a work very proper for Gospel times; it always was a duty, and there was ever reason for it under the former dispensation, and much more under the present one; and there will be still more reason for it in the latter day here referred to, when antichrist will be destroyed, the kingdom of Christ will be enlarged, and his church will be in a very glorious state and condition, her walls will be salvation, and her gates praise; when the saints will be stirring up one another to this service, and engaging in it with all readiness and cheerfulness; see Rev 11:15,

call upon his name: which takes in the whole of religions worship, of which Christ is the object, being the true Jehovah; and particularly prayer, in which his name is invoked together with faith in him, and expressions of affection to his name; which is precious to believers, and is as ointment poured out:

declare his doings among the people; not merely his works of creation, in which he was equally concerned with his divine Father; nor so much his miracles which he wrought when on earth, in proof of his deity and Messiahship, and in confirmation of his doctrine; but his acts of obedience and righteousness, which were perfect; and his bearing the sins of his people, and the punishment due to them; and so fulfilled the whole law, and hereby accomplished the great work of redemption and salvation; which, according to his orders, have been published among the Gentiles, for their good, and his glory:

make mention that his name is exalted; that is, he himself, who has a name given him above every name; for having obeyed, suffered, and died in the room of his people, he is by his Father, according to promise, exalted, by raising him from the dead, receiving him into heaven, placing him at his right hand, giving him all power in heaven and in earth, and causing angels, authorities, principalities, and powers, to be subject to him; all which is to be made mention of, to the honour of his name: or else the sense is, to speak of him, to make mention of his name, of his person, of his offices, of his grace and salvation, that he may be exalted in each of them by his people; for he is, and ought to be, exalted in their hearts, and with their lips, since he is above all in the excellency of his person, and is their only Saviour and Redeemer, Head and Husband; and so he will be exalted more abundantly in the latter day. See Gill on Isa 2:11.

make mention--Hebrew, "cause it to be remembered."