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 82:1Before the great Judge, the judges of the earth are rebuked, exhorted, and threatened. (Psa 82:1-8)
congregation--(Compare Exo 12:3; Exo 16:1).
of the mighty--that is, of God, of His appointment.
the gods--or, "judges" (Exo 21:6; Exo 22:9), God's representatives.
psa 82:2accept the persons--literally, "lift up the faces," that is, from dejection, or admit to favor and communion, regardless of merit (Lev 19:15; Pro 18:5).
psa 82:3So must good judges act (Psa 10:14; Job 29:12).
psa 82:4poor and needy--(Compare Psa 34:10; Psa 41:1).
psa 82:5By the wilful ignorance and negligence of judges, anarchy ensues (Psa 11:3; Psa 75:3).
out of course--(Compare Margin; Psa 9:6; Psa 62:2).
psa 82:6Though God admitted their official dignity (Joh 10:34), He reminds them of their mortality.
psa 82:7fall like, &c.--be cut off suddenly (Psa 20:8; Psa 91:7).
psa 82:8As rightful sovereign of earth, God is invoked personally to correct the evils of His representatives.