If I forget thee, O Jerusalem,.... This was said by one or everyone of the Levites; or singers, as Aben Ezra and Kimchi; or by the congregation of Israel, as Jarchi; by one of them, in the name of the rest; or by the composer of the psalm.
The Targum is,"the voice of the Spirit of God answered and said, "if I forget", &c.''that is, to weep over the calamities of Jerusalem; which might be thought, if the songs of Zion were sung; or to pray for the restoration of her prosperity and peace; as the church of Christ may be said to be forgotten, when men forget to mourn over its breaches, and show no concern for the reparation of them; or at the death of principal persons, which they lay not to heart; or at the great decay of religion in those that survive; or at the sins of professors, and their disregard to the word and ordinances: also when they forget to pray for her happiness in general; for the good of her members in particular; and especially for her ministers, that they may have assistance and success; and for a blessing on the word and ordinances, and for the conversion of sinners; and when they forget the worship of the Lord in it, and forsake the assembling of themselves together;let my right hand forget [her cunning]; her skill in music, particularly in playing on the harp; see 1Sa 16:16; the harp was held in the left hand, and struck with the right; and that more softly or hardly, as the note required, in which was the skill or cunning of using it.