What is the meaning of your statement in the chapter on fasting: “The mouth is in the ruling of the exterior”?

Question:
He says: Honorable Shaykh, may Allah grant you success, what is the meaning of your statement in the lesson that the mouth is in the ruling of the exterior? What does that mean?

Answer:
Yes, it is in the ruling of the exterior in that if he puts something in it while he is fasting, his fast is not affected, just as if he put it in his hand or on any of his other limbs. This is among the external things. But if it reaches his throat, then the question arises. As long as it is in the mouth and has not reached the throat, it is like if he put it in his hand or on his cheek or something similar; it has no effect. The evidence that the mouth and nose are in the ruling of the exterior is that the Prophet (peace and blessings be upon him) made rinsing the mouth and sniffing water into the nose obligatory, making them part of the face in ablution. He made the nose and mouth part of the face, requiring rinsing and sniffing. Yes.