What is the evidence for distinguishing between coercion in speech and coercion in action?

Question:
He says: Honorable Shaykh, may Allah grant you success, the scholars distinguish between one who is coerced into disbelief by speech but not by action. What is the evidence for this distinction?

Answer:
The evidence for the distinction is clear: the hadith of the two men who passed by an idol that no one would pass without offering something to it. They said to one of them, "Offer something to it." He said, "I would never offer anything to anyone other than Allah." They beheaded him, and he entered Paradise. They said to the other, "Offer something, even a fly." He offered a fly, they let him go, and he entered the Fire. This is evidence that the act of shirk (associating partners with Allah) is not excused, even if a person is killed; he must be patient. As for speech, there is a dispensation (rukhsah) for him to utter it while his heart remains firm in faith, his heart firm in faith. Yes.