A Commentary, Critical, Practical, and Explanatory on the Old and New Testaments, by Robert Jamieson, A.R. Fausset and David Brown  at sacred-texts.com
psa 52:1Compare Sa1 21:1-10; Sa1 22:1-10, for the history of the title. Psa 52:1 gives the theme; the boast of the wicked over the righteous is vain, for God constantly cares for His people. This is expanded by describing the malice and deceit, and then the ruin, of the wicked, and the happy state of the pious. (Psa 52:1-9)
mighty man--literally, "hero." Doeg may be thus addressed, ironically, in respect of his might in slander.
psa 52:2tongue--for self.
mischiefs--evil to others (Psa 5:9; Psa 38:12).
working deceitfully-- (Psa 10:7), as a keen, smoothly moving razor, cutting quietly, but deeply.
psa 52:4all-devouring--literally, "swallowing," which utterly destroy (compare Psa 21:9; Psa 35:25).
psa 52:5likewise--or, "so," "also," as you have done to others God will do to you (Psa 18:27). The following terms describe the most entire ruin.
psa 52:6shall . . . fear--regard with religious awe.
laugh at him--for his folly;
psa 52:7for trusting in riches and being strong in "wickedness."
wickedness--literally, "mischief" (Psa 52:2), instead of trusting in God.
the man--literally, "the mighty man," or "hero" (Psa 52:1).
psa 52:8The figure used is common (Psa 1:3; Jer 11:16).
house, &c.--in communion with God (compare Psa 27:4-5).
for ever and ever--qualifies "mercy."
psa 52:9hast done--that is, what the context supplies, "preserved me" (compare Psa 22:31).
wait . . . name--hope in Thy perfections, manifested for my good (Psa 5:11; Psa 20:1).
for it is good--that is, Thy name, and the whole method or result of its manifestation (Psa 54:6; Psa 69:16).