The ruling on the ablution of a seated person who sleeps while firmly supported.

The Shaykh : ...representing a state from which it is not possible for anything to emerge that would invalidate his ablution, such as sound or wind, but reality is the opposite; that is, the sleeper... in his sleep, something may come out of him... is that correct or not? So what is the benefit of this restriction? The most correct opinion is ; and for this reason, an imam of the imams of hadith and jurisprudence returned to this opinion, namely Abu 'Ubaydah al-Qasim ibn Sallam, the famous hadith scholar and linguist, author of the book "Gharib al-Hadith."
He used to hold the view I read in the title, that the sleep of a seated person who is firmly supported does not invalidate the ablution, until one day he was sitting in the Friday mosque listening to the preacher, and a man fell asleep next to him. When the preacher finished and the iqamah was called for prayer, he said to him: "Get up and perform wudu; you have slept." He said: "No, I did not sleep." He said to him: "You slept, and wind also came out of you." He said: "No, it was you from whom the wind came out."
And from that day, he returned to the generality of the hadith: ; because he saw with his own eyes a man who was sleeping while firmly supported, and he was saying to him: "I did not sleep" in the first place, and he said to him: "You slept, and on top of that, you did something else." He said to him: "No, you are the one who did it and you are the one who acted."
Yes.