To the prophecies of gospel grace very fitly is a song annexed, in which we may give God the glory and take to ourselves the comfort of that grace: In that day, the gospel day, which the day of the victories and enlargements of the Old Testament church was typical of (to some of which perhaps this has a primary reference), in that day this song shall be sung; there shall be persons to sing it, and cause and hearts to sing it; it shall be sung in the land of Judah, which was a figure of the gospel church; for the gospel covenant is said to be made with the house of Judah, Heb 8:8. Glorious things are here said of the church of God.

I.That it is strongly fortified against those that are bad (Isa 26:1): We have a strong city. It is a city incorporated by the charter of the everlasting covenant, fitted for the reception of all that are made free by that charter, for their employment and entertainment; it is a strong city, as Jerusalem was, while it was a city compact together, and had God himself a wall of fire round about it, so strong that none would have believed that an enemy could ever enter into the gates of Jerusalem, Lam 4:12. The church is a strong city, for it has walls and bulwarks, or counterscarps, and those of God's own appointing; for he has, in his promise, appointed salvation itself to be its defence. Those that are designed for salvation will find that to be their protection, Pe1 1:4.

II.That it is richly replenished with those that are good, and they are instead of fortifications to it; for the inhabitants of Jerusalem, if they are such as they should be, are its strength, Zac 12:5. The gates are here ordered to be opened, that the righteous nation, which keeps the truth, may enter in, Isa 26:2. They had been banished and driven out by the iniquity of the former times, but now the laws that were made against them are repealed, and they have liberty to enter in again. Or, There is an act for a general naturalization of all the righteous, whatever nation they are of, encouraging them to come and settle in Jerusalem. When God has done great things for any place or people he expects that thus they should render according to the benefit done unto them; they should be kind to his people, and take them under their protection and into their bosom. Note, 1. It is the character of righteous men that they keep the truths of God, a firm belief of which will have a commanding influence upon the regularity of the whole conversation. Good principles fixed in the head will produce good resolutions in the heart and good practices in the life. 2. It is the interest of states to countenance such, and court them among them, for they bring a blessing with them.

III.That all who belong to it are safe and easy, and have a holy security and serenity of mind in the assurance of God's favour. 1. This is here the matter of a promise (Isa 26:3): Thou wilt keep him in peace, peace, in perfect peace, inward peace, outward peace, peace with God, peace of conscience, peace at all times, under all events; this peace shall he be put into, and kept in the possession of, whose mind is stayed upon God, because it trusts in him. It is the character of every good man that he trusts in God, puts himself under his guidance and government, and depends upon him that it shall be greatly to his advantage to do so. Those that trust in God must have their minds stayed upon him, must trust him at all times, under all events, must firmly and faithfully adhere to him, with an entire satisfaction in him; and such as do so God will keep in perpetual peace, and that peace shall keep them. When evil tidings are abroad those shall calmly expect the event, and not be disturbed by frightful apprehensions arising from them, whose hearts are fixed, trusting in the Lord, Psa 112:7. 2. It is the matter of a precept (Isa 26:4): "Let us make ourselves easy by trusting in the Lord for ever; since God has promised peace to those that stay themselves upon him, let us not lose the benefit of that promise, but repose an entire confidence in him. Trust in him for ever, at all times, when you have nothing else to trust to; trust in him for that peace, that portion, which will be for ever." Whatever we trust to the world for, it will be but for a moment: all we expect from it is confined within the limits of time. But what we trust in God for will last as long as we shall last. For in the Lord Jehovah-Jah, Jehovah, in him who was, and is, and is to come, there is a rock of ages, a firm and lasting foundation for faith and hope to build upon; and the house built on that rock will stand in a storm. Those that trust in God shall not only find in him, but receive from him, everlasting strength, strength that will carry them to everlasting life, to that blessedness which is for ever; and therefore let them trust in him for ever, and never cast away nor change their confidence.

Trust ye in the Lord for ever,.... In the Word of the Lord for ever and ever, as the Targum again; that is, at all times, in every state and condition, in times of affliction, temptation, and darkness; for he will support under, and in his own time deliver out of every trouble, and cause all things to work to gether for good; and trust in him always, for everything, for all temporal blessings, and for all spiritual ones, and for eternal life and happiness; for he has them, has promised them, and will give them:

for in the Lord JEHOVAH is everlasting strength; Christ is the Lord JEHOVAH, which is, and was, and is to come, self-existent, eternal, and immutable; and in him is strength, as well as righteousness for his people; and that for everything it is wanted for, to bear up under temptations and afflictions, to withstand every spiritual enemy, to exercise every grace, and discharge every duty: and this strength is everlasting; it always continues in him, and is always to be had from him; he is the "eternal" God, who is the refuge of his people, and his "arms" of power and might "underneath" them are "everlasting": the words may be rendered, "for in Jah" is "Jehovah, the Rock of ages" (q); Jehovah the Son is in Jehovah the Father, according to Joh 10:38 or "Jah Jehovah" is "the Rock of ages", so Vitringa; he is the "Rock" on which the church and every believer is built, against which "the gates of hell cannot prevail"; and he has been the Rock of his people in ages past, and will be in ages to come: or "of worlds"; this world, and that to come; and so it is explained in the Talmud (r), he that trusts in the Lord has a refuge in this world, and in the world to come.

(q) "in Jah est Jehovah, rupes saeculorum". (r) T. Bab. Menachot, fol. 29. 2.

Lord JEHOVAH--Hebrew, Jah, Jehovah. The union of the two names expresses in the highest degree God's unchanging love and power (compare Psa 68:4). This passage, and Isa 12:2; Exo 6:3; Psa 83:18, are the four in which the English Version retains the JEHOVAH of the original. MAURER translates, "For JAH (the eternal unchangeable One, Exo 3:14) is JEHOVAH, the rock of ages" (compare Isa 45:17; Deu 32:15; Sa1 2:2).