10, 11. Levites . . . shall . . . bear--namely, the punishment of
      their iniquity . . . Yet they shall be ministers--So Mark, a Levite, nephew of Barnabas (Ac 4:36), was punished by Paul for losing an opportunity of bearing the cross of Christ, and yet was afterwards admitted into his friendship again, and showed his zeal (Ac 13:13; 15:37; Col 4:10; 2Ti 4:11). One may be a believer, and that too in a distinguished place, and yet lose some special honor--be acknowledged as pious, yet be excluded from some dignity [BENGEL].
      charge at the gates--Better to be "a doorkeeper in the house of God, than to dwell in the tents of wickedness" (Ps 84:10). Though standing as a mere doorkeeper, it is in the house of God, which hath foundations: whereas he who dwells with the wicked, dwells in but shifting tents.

JFB.