C. F. Keil and Franz Delitzsch on Proverbs 3:30

Pro 3:30

A third illustration of the same principle is peaceableness:

Contend not with a man without a cause,

When he has inflicted no evil upon thee.

Instead of תּרוּב, or as the Kerı̂ has amended it תּריב, the abbreviated form תּרב or תּרב would be more correct after אל; רוּב or ריב (from רב, to be compact) means to fall upon one another, to come to hand-blows, to contend. Contending and quarrelling with a man, whoever he may be, without sufficient reason, ought to be abandoned; but there exists no such reason if he has done me no harm which I have to reproach him with. גּמל רעה with the accus. or dat. of the person signifies to bring evil upon any one, malum inferre, or also referre (Schultens), for גּמל (cogn. גּמר) signifies to execute, to complete, accomplish - both of the initiative and of the requital, both of the anticipative and of the recompensing action; here in the former of these senses.