Blessed is the people that know the joyful sound. Here the same train of reflection concerning the Church is pursued, not only because unbelievers are blind to the consideration of God's works, but also because the prophet has no other purpose in view than to inspire the godly with good hope, that they may with confidence rely upon God, and not be discouraged by any adversities from boldly calling upon him. It is declared that those are happy to whom it is given to rejoice in God; for although all men in common are sustained and nourished by his liberality, yet the feeling of his paternal goodness is far from being experienced by all men in such a manner as to enable them, from a certain persuasion that he is favorable to them, to congratulate themselves upon their happy condition. It is, therefore, a singular privilege which he confers upon his chosen ones, to make them taste of his goodness, that thereby they may be encouraged to be glad and rejoice. And, in fact, there is not a more miserable condition than that of unbelievers, when by their brutish insensibility they trample under foot the Divine benefits which they greedily devour; for the more abundantly God pampers them, the fouler is their ingratitude. True happiness then consists in our apprehending the Divine goodness which, filling our hearts with joy, may stir us up to praise and thanksgiving. The prophet afterwards proves from the effect, that those who with joy and delight acknowledge God to be their father are blessed, because they not only enjoy his benefits, but also, confiding in his favor, pass the whole course of their life in mental peace and tranquillity. This is the import of walking in the light of God's countenance: it is to repose upon his providence from the certain persuasion that he has a special care about our well-being, and keeps watch and ward effectually to secure it. The expressions rejoicing in his name, and glorying in his righteousness, are to the same purpose. The idea involved in them is, that believers find in God abundant, yea more than abundant, ground to rejoice and glory. The word daily appears to denote steadfast and unwavering perseverance; and thus there is indirectly censured the foolish arrogance of those who, inflated only with wind and presuming on their own strength, lift up their horns on high. Standing as they do upon an insecure foundation, they must at length inevitably fall. Whence it follows, that there is no true magnanimity nor any power which can stand but that which leans upon the grace of God alone; even as we see how Paul (Romans 8:31) nobly boasts, "If God be for us, who can be against us?" and defies all calamities both present and to come.

Blessed is the people - Happy is their condition. See the notes at Psalm 1:1.
That know the joyful sound - That hear that sound. DeWette explains this of the call to the festivals and offerings, Leviticus 23:24; Numbers 10:10; Psalm 27:6. That is, says he, those who honor and worship God. The Hebrew word - תרועה terû‛âh - means a loud noise; a tumult; especially, shouts of joy, or rejoicing, Job 8:21; 1-Samuel 4:5; the "shout of a king," that is, the joyful acclamations with which a king is welcomed, Numbers 23:21; the shout of battle, Jeremiah 4:19; Jeremiah 49:2. Then it means the sound or clangor of trumpets, Leviticus 25:9; Numbers 29:1-6. The word is, therefore, especially applicable to the sounding of the trumpets which attended the celebration of the great; festivals among the Hebrews, and there can be little doubt that this is the reference here. The idea is, that they are blessed or happy who are the worshippers of Yahweh, the true God; who are summoned to his service; who are convened to the place of his worship.
They shall walk, O Lord, in the light of thy countenance - They shall live in thy favor, and enjoy thy smiles.

Blessed is the people - "O the blessednesses of that people (אשרי העם( elp ashrey haam) that know the joyful sound;" that are spared to hear the sound of the trumpet on the morning of the jubilee, which proclaims deliverance to the captives, and the restoration of all their forfeited estates. "They shall walk vigorously (יהלכון yehallechun) in the light of thy countenance" (באור פניך beor paneycha) - the full persuasion of the approbation of God their Father, Redeemer, and Sanctifier.

Blessed [is] the people that (m) know the joyful sound: they shall walk, O LORD, in the light of thy (n) countenance.
(m) Feeling in their conscience that God is their father.
(n) They will be preserved by your fatherly providence.

Blessed is the people that know the joyful sound,.... Of the love, grace, and mercy of God displayed in Christ, of peace and pardon by his blood, of justification by his righteousness, of atonement by his sacrifice, and of complete salvation by his obedience, sufferings, and death; this is the sound of the Gospel, and a joyful one it is to sensible sinners; and is so called in allusion either to a shout made upon a victory gained, and such a sound is the Gospel; it declares victory by Christ over sin, Satan, the world, and death, and every enemy; and that he has made his people more than conquerors over them; or to the jubilee trumpet, which proclaimed liberty and a restoration of inheritances, Leviticus 25:9 and so the Gospel proclaims liberty to the captives, freedom from the dominion of sin, and condemnation by it, from the tyranny of Satan, and the bondage of the law; and gives an account of the inheritance the saints have in Christ, and through his death, to which they are regenerated, and for which they are made meet by the Spirit of God, and of which he is the seal and earnest: or to the silver trumpets, for the use of the congregation of Israel, and blown at their solemn feasts, and other times, and were all of a piece, Numbers 10:1, the trumpet of the Gospel gives a certain sound, an even one, a very musical one; there is no jar nor discord in it; is a soul charming alluring sound, and very loud; it has reached, and will reach again, to the ends of the earth, Romans 10:18, it is a blessing to hear it, but it is a greater to "know" it, not merely notionally, but spiritually and experimentally; so as not only to approve of it, and be delighted with it, but so as to distinguish it from all other sounds; and by faith to receive it, and appropriate the things it publishes to a man's own soul; and such must be "blessed", or happy persons, for the reasons following in this verse, and in Psalm 89:16,
they shall walk, O Lord, in the light of thy countenance: enjoy the gracious presence of God, have the manifestation of himself, the discoveries of his love, communion with him through Christ, and the comforts of the Holy Spirit, and these continued; so that they shall walk in the sunshine of these things, though not always; for sometimes they walk in darkness, and see no light; but it is an unspeakable mercy and blessing to walk herein at any time, for ever so short a season, see Psalm 4:6.

Happy are those who so know the joyful sound of the gospel as to obey it; who experience its power upon their hearts, and bring forth the fruit of it in their lives. Though believers are nothing in themselves, yet having all in Christ Jesus, they may rejoice in his name. May the Lord enable us to do so. The joy of the Lord is the strength of his people; whereas unbelief dispirits ourselves and discourages others. Though it steals upon us under a semblance of humility, yet it is the very essence of pride. Christ is the Holy One of Israel; and in him was that peculiar people more blessed than in any other blessing.

His government of righteousness is served by "mercy" and "truth" as ministers (Psalm 85:10-13).
know the joyful sound--understand and appreciate the spiritual blessings symbolized by the feasts to which the people were called by the trumpet (Leviticus 25:9, &c.).
walk . . . countenance--live in His favor (Psalm 4:6; Psalm 44:3).

The poet has now described what kind of God He is upon whose promise the royal house in Israel depends. Blessed, then, is the people that walks in the light of His countenance. הלּך of a self-assured, stately walk. The words ידעי תּרוּעה are the statement of the ground of the blessing interwoven into the blessing itself: such a people has abundant cause and matter for exultation (cf. Psalm 84:5). תּרוּעה is the festive sound of joy of the mouth (Numbers 23:21), and of trumpets or sackbuts (Psalm 27:6). This confirmation of the blessing is expanded in Psalm 89:17-19. Jahve's שׁם, i.e., revelation or manifestation, becomes to them a ground and object of unceasing joy; by His צדקה, i.e., the rigour with which He binds Himself to the relationship He has entered upon with His people and maintains it, they are exalted above abjectness and insecurity. He is תּפארת עזּמו, the ornament of their strength, i.e., their strength which really becomes an ornament to them. In Psalm 89:18 the poet declares Israel to be this happy people. Pinsker's conjecture, קרנם (following the Targum), destroys the transition to Psalm 89:19, which is formed by Psalm 89:18. The plural reading of Kimchi and of older editions (e.g., Bomberg's), קרנינוּ, is incompatible with the figure; but it is immaterial whether we read תּרים with the Chethb (Targum, Jerome), or with the Ker (lxx, Syriac) תּרוּם.
(Note: Zur Geschichte des Karaismus, pp. קפא and קפב, according to which, reversely, in Joshua 5:1 עברוּ is to be read instead of עברם, and Isaiah 33:2 זרענוּ instead of זרעם, Psalm 12:8 תשמרנּוּ instead of תשמרם, Micah 7:19 חטאתנוּ instead of חטאתם, Job 32:8 תביננּוּ instead of תבינם, Proverbs 25:27 כבודנוּ instead of כבודם (the limiting of our honour brings honour, - an unlikely interpretation of the חקר).)
מגנּנוּ and מלכּנוּ in Psalm 89:19 are parallel designations of the human king of Israel; מגן as in Ps 47:10, but not in Psalm 84:10. For we are not compelled, with a total disregard of the limits to the possibilities of style (Ew. 310, a), to render Psalm 89:19: and the Holy One of Israel, (as to Him, He) is our King (Hitzig), since we do not bring down the Psalm beyond the time of the kings. Israel's shield, Israel's king, the poet says in the holy defiant confidence of faith, is Jahve's, belongs to the Holy One of Israel, i.e., he stands as His own possession under the protection of Jahve, the Holy One, who has taken Israel to Himself for a possession; it is therefore impossible that the Davidic throne should become a prey to any worldly power.

Know - Who enjoy the presence of God and his ordinances, to which they are called by the sound of trumpets. Walk - Under the comfortable influences of thy favour.