Here, I. David calls upon others to which well to Jerusalem, Psa 122:6, Psa 122:7. Pray for the peace of Jerusalem, for the welfare of it, for all good to it, particularly for the uniting of the inhabitants among themselves and their preservation from the incursions of enemies. This we may truly desire, that in the peace thereof we may have peace; and this we must earnestly pray for, for it is the gift of God, and for it he will be enquired of. Those that can do nothing else for the peace of Jerusalem can pray for it, which is something more than showing their good-will; it is the appointed way of fetching in mercy. The peace and welfare of the gospel church, particularly in our land, is to be earnestly desired and prayed for by every one of us. Now, 1. We are here encouraged in our prayers for Jerusalem's peace: Those shall prosper that love thee. We must pray for Jerusalem, not out of custom, nor for fashion's sake, but out of a principle of love to God's government of man and man's worship of God; and, in seeking the public welfare, we seek our own, for so well does God love the gates of Zion that he will love all those that do love them, and therefore they cannot but prosper; at least their souls shall prosper by the ordinances they so dearly love. 2. We are here directed in our prayers for it and words are put into our mouths (Psa 122:7): Peace be within thy walls. He teaches us to pray, (1.) For all the inhabitants in general, all within the walls, from the least to the greatest. Peace be in thy fortifications; let them never be attacked, or, if they be, let them never be taken, but be an effectual security to the city. (2.) For the princes and rulers especially: Let prosperity be in the palaces of the great men that sit at the helm and have the direction of public affairs; for, if they prosper, it will be well for the public. The poorer sort are apt to envy the prosperity of the palaces, but they are here taught to pray for it.

II.He resolves that whatever others do he will approve himself a faithful friend to Jerusalem, 1. In his prayers: "I will now say, now I see the tribes so cheerfully resorting hither to the testimony of Israel, and the matter settled, that Jerusalem must be the place where God will record his name, now I will say, Peace be within thee." He did not say, "Let others pray for the public peace, the priests and the prophets, whose business it is, and the people, that have nothing else to do, and I will fight for it and rule for it." No; "I will pray for it too." 2. In his endeavours, with which he will second his prayers: "I will, to the utmost of my power, seek thy good." Whatever lies within the sphere of our activity to do for the public good we must do it, else we are not sincere in praying for it. Now it might be said, No thanks to David to be so solicitous for the welfare of Jerusalem; it was his own city, and the interests of his family were lodged in it. This is true; yet he professes that this was not the reason why he was in such care for the welfare of Jerusalem, but it proceeded from the warm regard he had, (1.) To the communion of saints: It is for my brethren and companions' sakes, that is, for the sake of all true-hearted Israelites, whom I look upon as my brethren (so he called them, Ch1 28:2) and who have often been my companions in the worship of God, which has knit my heart to them. (2.) To the ordinances of God: He had set his affections to the house of his God (Ch1 29:3); he took a great pleasure in public worship, and for that reason would pray for the good of Jerusalem. Then our concern for the public welfare is right when it is the effect of a sincere love to God's institutions and his faithful worshippers.

Because of the house of the Lord our God,.... Not because of his own palace, nor because of his own house and family; nor because of his own personal interest; though all were concerned in the peace of Jerusalem: but chiefly because of the sanctuary of the Lord, as the Targum; because of the worship and service of God in it; because of his great love and zeal for the house and church of the living God, which ate him up, Psa 69:9;

I will seek thy good; the good of Jerusalem, the good of the church of God; do all the good he could to it both with his purse and prayers, and by stirring up others to do the same; see Psa 51:18.

Next: Psalms Chapter 123