New Defender's Study Bible Notes
4:1 God of my righteousness. This is the only place in the Bible where God is addressed by this name. It stresses fittingly the great fact that Christ Himself is our righteousness (I Corinthians 1:30; II Corinthians 5:21).
4:2 sons of men. Note that David calls first upon God (Psalm 4:1) before he speaks to men. This is surely the proper route when believers are being oppressed by men.
4:2 leasing. That is, “deceit.”
4:7 gladness in my heart. Christ in the heart is better than corn in the barn!
Psalm 5 (title) Nehiloth. Nehiloth occurs only here, and is of uncertain meaning. It possibly means “wind instruments” and is so rendered in some editions of the Bible. Its unique use here may be connected with the fact that Psalm 5 is the first of the imprecatory psalms.