New Defender's Study Bible Notes
51:12 Restore unto me. Once a believer has truly been saved, either before or after Christ, he can never become unsaved (John 10:28; Romans 8:35; etc.). However, through overt sin, a believer may lose the joy of his salvation.
Psalm 52 (title) Maschil. This is one of the Maschil psalms (see Psalm 32). It was written by David as an indictment of the treacherous act of Doeg, the Edomite (I Samuel 21:7; 22:9-19).