“When the fool is forbidden, he rushes toward it;
He disobeys, for the fool is bent on defiance.”

That is, toward foolishness.

The answer is: This is possible only where there is no ambiguity, and nothing suitable to serve as the pronoun’s antecedent has preceded it except what the wording implies. In that case, the recognition that the explicit wording requires an implicit referent indicates what is meant. But when an explicitly mentioned noun occurs shortly before the pronoun, it is not proper to disregard it as the antecedent and instead refer the pronoun to something prior that is not mentioned in the discourse. The invalidity of this in language is self-evident.

Fourth: In such a case, the pronoun cannot properly be singular. For Allah created Adam in the image of all his descendants. To single out one individual who has not previously been mentioned, saying that Allah created Adam in his image, is utterly implausible. This is especially so since the words “When one of you fights” and “When one of you strikes” apply generally to everyone who is struck. Allah created Adam in the image of them all, so there is no reason to use a singular pronoun. Likewise, the words “Let none of you say, ‘May Allah disfigure your face and the face of anyone whose face resembles yours’” apply generally to everyone addressed, and Allah created them all in Adam’s image.