Counterexample

To disprove prophetic perfection, one counterexample of genuine character flaw would suffice. Yet: (1) His enemies in Mecca scrutinized him for 40 years before prophethood—they called him "Al-Amin." (2) After prophethood, enemies sought desperately for flaws—found none. (3) Modern critics have attempted attacks—all have been historically or contextually debunked. (4) After 1400 years of scrutiny by hostile critics, no genuine flaw has ever been established.

This applies the counterexample method: to refute a universal claim (prophetic perfection), one need only produce a single valid counterexample. Despite 1400 years of intense scrutiny by motivated critics, none has been found.