{Feed him} (ps(936d)ize auton). Quotation from LXX text of
 Pr 25:21f . Present active imperative of verb from ps(936d)os, a
morsel, and so to feed crumbs to babies, then to feed in general.
In N.T. only here and  1Co 13:3 . {Thou shalt heap}
(s(9372)euseis). Future active of old verb s(9372)eu(935c) from s(9372)os, a
heap. In N.T. only here and  2Ti 3:6 . {Coals of fire}
(anthrakas puros). That is, burning or live coals. {Anthrax}
(our "anthracite") is an old word, only here in N.T. It is a
metaphor for keen anguish. The Arabs have a proverb "coals in the
heart," "fire in the liver." Such kindness may lead to repentance
also.