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Lit., "who has retaliated with the like of what he had been afflicted with" - i.e., has acted only in self-defence and done to his enemy no more than the enemy had done to him. (A similar phrase, relating to retaliation in argument, is found in 16:126 and explained in the corresponding note [150].)
While the opening sentence of this verse stresses the principle of self-defence as the only justification of war (cf. 2:190 and {192-193}) - with the proviso that retaliation must not exceed the injury initially suffered - the concluding part of the verse implies that in case of repeated, unprovoked aggression the believers are allowed to wage an all-out war with a view to destroying completely the enemy's military power. Since such an all-out war might seem to conflict with the principle of limited retaliation alluded to above, the Qur'an states that God absolves the believers of what otherwise might have been a sin, since it is they "against whom war is being wrongfully waged" (verse {39}) by repeated acts of aggression.
Ordinarily Muslims are enjoined to bear injuries with patience and return good for evil (xxiii. 96). But there are occasions when human feelings get the better of our wise resolutions, or when, in a state of conflict or war, we return "as good as we get". In that case our retaliation is permissible, provided the injury we inflict is not greater than that we receive. After such retaliation we are even, but if the other side again acts aggressively and goes beyond all bounds in attacking us, we are entitied to protection from Allah in spite of all our faults; for Allah is One that blots out our sins, and forgives again and again.