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Lit., "every time". The covenants referred to are agreements between the Muslim community and non-Muslim political groupments. Although this passage is addressed, in the first instance, to the Prophet, the "thou" relates here to every follower of the Qur'an and, thus, to the Muslim community of all times. With the above verse, the discourse returns to the subject of war with unbelievers to which most of this surah is devoted. The reference to the unbelievers' "breaking their covenants" has two implications: firstly, that the establishment of covenants (i.e. of peaceful relations) with non-Muslims is not only permissible but, in fact, desirable (cf. verse {61}); and, secondly, that the Muslims may resort to war only if and when the other party is openly hostile to them.
The immediate occasion was the repeated treachery of the Banu Quraiza after their treaties with the Muslims. But the general lesson remains, as noted in the two following verses. Treachery in war is doubly wrong, for it endangers so many lives. Such treachery should be punished in such a way that it gets no chance again. Not only the actual perpetrators but those who follow their standard should be rendered powerless. And the broken treaty should be denounced so that the innocent party can at least fight on equal terms. From actual physical warfare we can carry the same lesson to spiritual warfare. A truce or understanding is possible with those who respect definite principles, not with those who have no principles and are merely out for oppression and wickedness. A) The purpose of the verse is to urge Muslims to act against their enemies described above with a severity and resoluteness which would serve as a deterrent to other enemies of Islam who might be inclined to follow their example and act treacherously towards Muslims.