Of my soul, i.e. of me; the soul being commonly put for the person, as Isaiah 46:2 Amos 6:8, compared with Genesis 22:16. 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 of the Psalms, and in the song of Habakkuk 3:3,9,13; which makes that opinion probable, that it was a musical note, directing the singer either to lift up his voice, or to make a short stop or pause, or to lengthen out 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 or observation of the singer and hearer.
Related Commentaries of Psalms 3:2
Psalms 3:2
2 Many there be which say of my soul, There is no help for him in God. Selah.