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I.e., by sincere repentance. Apart from its general significance, this may also be an allusion to the crime which Moses had committed in his youth bv slaying the Egyptian (see {28 :15-17}).
For my rendering of illa, in this context, as "and neither", see note [38] on 4:29 .
His slaying the Egyptian (n. 3146 to xxvi. 14), however defensible from certain aspects, was yet something from his past that had to be washed off, and Allah, Oft-Forgiving, Most Merciful, did it out of His abounding Grace. Nay, more; he was given a pure, Radiant Hand, as a Sign from Allah, as stated in the next verse.