C.H. Spurgeons's The Treasury of David
Verse 4. Let them now that fear the LORD say, that his mercy endureth for ever. If there were any throughout the world who did not belong to Israel after the flesh, but nevertheless had a holy fear and lowly reverence of God, the Psalmist calls upon them to unite with him in his thanksgiving, and to do it especially on the occasion of his exaltation to the throne; and this is no more than they would cheerfully agree to do, since every good man in the world is benefited when a true servant of God is placed in a position of honour and influence. The prosperity of Israel through the reign of David was a blessing to all who feared Jehovah. A truly God fearing man will have his eye much upon God's mercy, because he is deeply conscious of his need of it, and because that attribute excites in him a deep feeling of reverential awe. "There is forgiveness with thee that thou mayest be feared."
In the three exhortations, to Israel, to the house of Aaron, and to them that fear the Lord, there is a repetition of the exhortation to say, "that his mercy endureth for ever." We are not only to believe, but to declare the goodness of God; truth is not to be hushed up, but proclaimed. God would have his people act as witnesses, and not stand silent in the day when his honour is impugned. Specially is it our joy to speak out to the honour and glory of God when we think up, in the exaltation of his dear Son. We should shout "Hosannah," and sing loud "Hallelujahs" when we behold the stone which the builders rejected lifted into its proper place.
In each of the three exhortations notice carefully the word "now." There is no time like time present for telling out the praises of God. The present exaltation of the Son of David now demands from all who are the subjects of his kingdom continual songs of thanksgiving to him who hath set him on high in the midst of Zion. Now with us should mean always. When would it be right to cease from praising God, whose mercy never ceases?
The fourfold testimonies to the everlasting mercy of God which are now before us speak like four evangelists, each one declaring the very pith and marrow of the gospel; and they stand like four angels at the four corners of the earth holding the winds in their hands, restraining the plagues of the latter days that the mercy and long suffering of God may endure towards the sons of men. Here are four cords to bind the sacrifice to the four horns of the altar, and four trumpets with which to proclaim the year of jubilee to every quarter of the world. Let not the reader pass on to the consideration of the rest of the Psalm until he has with all his might lifted up both heart and voice to praise the Lord, "for his mercy endureth for ever."
"Let us with a gladsome mind
Praise the Lord, for he is kind;
For his mercies shall endure
Ever faithful, ever sure."
EXPLANATORY NOTES AND QUAINT SAYINGS
Verse 4. Them that fear the LORD. Who were neither of "the house of Aaron," that is, of the priests or Levites; nor of "the house of Israel," that is, native Jews; yet might be of the Jewish religion, and "fear the LORD." These were called proselytes, and are here invited to praise the Lord. Joseph Caryl.
Verse 4. God's mercy endureth for ever. That is, his covenant mercy, that precious church privilege: this is perpetual to his people, and should perpetually remain as a memorial in our hearts. And therefore it is that this is the foot or burden of these first four verses. Neither is there any idle repetition, but a notable expression of the saints' insatiableness of praising God for his never failing mercy. These heavenly birds having got a note, sing it over and over. In the last Psalm there are but six verses, yet twelve Hallelujahs. Abraham Wright.