John Wesley on Psalms 3:2

My soul - Of me: the soul being commonly put for the person. In God - God hath utterly forsaken him. Selah - This word is no where 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.