Psalms 3:2 - Joseph Benson’s Commentary on the Old and New Testaments

Many there be that say of my soul Of me; the soul being commonly put for the person: There is no help for him in God God hath utterly forsaken him for his many crimes, and will never help him more. Selah This word is nowhere used but in this poetical book, and in the song of Habakkuk. Probably it was a musical note, directing the singer either to lift up his voice, to make a pause, or to lengthen the tune. But, withal, it is generally placed at some remarkable passage; which gives occasion to think that it served also to quicken the attention of the singer and hearer.