Qutayba bin Sa'id bin Jamil قتيبة بن سعيد بن جميل · Fasting (Kitab Al-Siyam)

Al Bara’ (bin Azib) said “When a man fasted and slept, he could not eat till (another nigh) like it.” Sarmah bin Qais Al Ansari came to his wife while he was fasting and asked her Do you have something (to eat)? She replied “No”. Let me go and seek something for you. So, she went out and sleep overcame him. She came (back) and said (to him) .You are deprived (of food). He fainted before noon. He used to…

She never saw the Prophet (ﷺ) fasting the whole month except Sha'ban which he combined with Ramadan.

The Messenger of Allah (ﷺ) prohibited perpetual fasting. They (the people) said: You keep perpetual fasting, Messenger of Allah. He said: My position is not like that you yours. I am provided with food and drink.

AbuBakr ibn AbdurRahman reported on the authority of a Companion of the Prophet (ﷺ): I saw the Prophet (ﷺ) commanding the people while he was travelling on the occasion of the conquest of Mecca not to observe fast. He said: Be strong for your enemy. The Messenger of Allah (ﷺ) fasted himself. Narrated AbuBakr: A man who narrated his tradition to me said: I have seen the Messenger of Allah (ﷺ) in al-Arj pouring water over his head while he…

The Prophet (ﷺ) said: One of you should not say: I fasted the whole of Ramadan, and I prayed during the night in the whole of Ramadan. I do not know whether he disliked the purification; or he (the narrator) said: He must have slept a little and taken rest.

The father or Uncle of Mujibah al-Bahiliyyah visited the Messenger of Allah (ﷺ). He then went away and came to him (again) after one year when his condition and appearance had changed. He said: Messenger of Allah, do you not recognize me? He asked: Who are you? He replied: I am al-Bahili who came to you last year. He said: What has changed you? You were looking well, then you were good in appearance? He said: I have only food…

When one of you is invited (to a meal), and he is fasting, he should say that he is fasting.

When the Messenger of Allah (ﷺ) observed I'tikaf, he would put his head near me, and I would comb it. and he entered the house only to fulfill human needs (i.e. to urinate or to relieve himself).

The tradition mentioned above (No. 2468) has also been transmitted by Abdullah ibn Budayl through a different chain of narrators in a similar way. This version adds: While he (Umar) was observing i'tikaf (in the sacred mosque), the people uttered (loudly): "Allah is most great." He said: What is this, Abdullah? He said: These are the captives of the Hawazin whom the Messenger of Allah (ﷺ) has set free. He said: This slave-girl too? He sent her along with them.