[Explanation]

The word “yuṣab” may be recited in two ways: with a fatḥah on the letter ṣād—yuṣab—or with a kasrah—yuṣib; both pronunciations are correct.

With the reading “yuṣab minhu,” the meaning is that Allah decrees calamities for the person in order to test him: will he show patience or fall into irritation? As for the wording “yuṣib minhu,” it is broader, indicating that the affliction may come from Allah or from other causes as well.

This unqualified ḥadith, however, is restricted by other reports that clarify the intent: when Allah wants good for a person and he responds with patience and hopeful expectation of reward, Allah afflicts him so as to try him. Should he fail to be patient, a man might be struck by many trials yet gain no benefit from them, and Allah would not be intending good for him.

Indeed, the unbelievers suffer numerous hardships, yet they persist in their disbelief until they die upon it; such people, beyond doubt, were not intended for good.

The point, then, is that when Allah desires good for someone, He afflicts him and the person faces those misfortunes with patience. That is pure benefit for him, because—as noted earlier—calamities erase sins and remove wrong deeds. Obviously, the expiation of sins and misdeeds is an unquestionable advantage, for worldly misfortunes are no more than temporary pains that fade with the passing of days; once some time has gone by, the hardship lightens. The punishment of the Hereafter, however, is everlasting—Allah’s refuge is sought. Therefore, if Allah washes away your sins through these trials, that is surely for your own good.