...from the fitra (innate disposition) (11), and he mentioned among them rinsing the mouth and inhaling water. The fitra is the sunnah, and his mention of them as being from the fitra indicates that they differ from the rest of the wudu. Furthermore, the mouth and nose are interior organs, so it is not obligatory to wash them, just as it is not for the interior of the beard or the interior of the eyes; also, because the face is defined as that which encounter occurs with, and encounter does not occur with these two. Our evidence is what ‘A’isha, may Allah be pleased with her, narrated: that the Messenger of Allah, may Allah bless him and grant him peace, said: ‘Rinsing the mouth and inhaling water are part of the wudu which is indispensable.’ Reported by Abu Bakr (12) in "al-Shafi" with his chain of narration from Ibn al-Mubarak, from Ibn Jurayj, from ‘Urwa, from ‘A’isha, and it was extracted by al-Daraqutni in his "Sunan" (13). Also, because everyone who described the wudu of the Messenger of Allah, may Allah bless him and grant him peace, thoroughly, mentioned that he rinsed his mouth and inhaled water. His persistence in them indicates their obligation, because his action serves as an explanation and detailing of the wudu ordered in the Book of Allah [the Exalted; for they are two parts of the face, and washing them is not difficult; according to His saying (the Exalted): {Wash your faces}, and they are like the cheek. Evidence that they are in the ruling of pure things is that the fasting person does not break their fast by placing food in them, but breaks their fast if vomit reaches them, and the sanctity of fosterage (rada‘) is not established by milk reaching them, and the hadd punishment for drinking wine is not mandatory for having it in them, yet it is mandatory to wash them if they are defiled with impurity] (15). The fact that they are from the fitra does not negate their obligation, as the fitra includes both the obligatory and the recommended, which is why he mentioned circumcision in it, and it is obligatory. [And joining them with what is not obligatory, or their pairing with it, does not prevent obligation, as evidenced by circumcision, and His saying (the Exalted): {So make a contract with them if you know there is good in them and give them from the wealth of Allah which He has given you.} Writing the contract (kitaba) is not obligatory, while giving is obligatory] (16).