It was narrated from Abu Hurairah that: The Prophet (ﷺ) said: "Perform ablution after (eating) that which has been changed by fir." Ibn 'Abbas said: "Should I do ablution after (touching) hot water?" Abu Hurairah said: "O son of my brother, when I narrate a Hadith of the Messenger of Allah (ﷺ) to you, then do not try to make examples for it."

It was narrated that 'Aishah said: "The Messenger of Allah (ﷺ) said: 'Perform ablution after (eating) that which has been changed by fire.'"

It was narrated that Anas bin Malik would place his hands over his ears and say: "May my ears be made deaf, if I did not hear the messenger of Allah saying: 'Perform ablution after (eating) that which has been changed by fire.'"

It was narrated that Jabir bin 'Abdullah said: "The Prophet, Abu Bakr and 'Umar ate some bread and meat, and they did not perform ablution (after that)."

Zuhri said: "I had dinner with Walid or Abdul-Malik. When the time for prayer came, I got up to perform ablution. Ja'far bin 'Amr bin Umayyah said: 'I bear witness that my father bore witness, that the Messenger of Allah (ﷺ) ate food that had been changed by fire, then he performed prayer, and he did not perform ablution.' (Sahih) And 'Ali bin 'Abdullah bin 'Abbas said: 'And I bear witness to similar from my father.'"

It was narrated that Umm Salamah said: "Some meat from the shoulder of a sheep was brought to the Messenger of Allah (ﷺ) and he ate some of it, then he performed prayer without touching water (for ablution)."

Suwaid bin Nu'man Ansari narrated that : They went out with the Messenger of Allah (ﷺ) to Khaibar. When they reached As-Sahba' (a place near Khaibar), he performed 'Asr (Afternoon prayer), then he called for food, but no food was brought except for Sawiq. So they ate that and drank, and then he called for water and rinsed his mouth, then he stood up and led us for Maghrib (Sunset) prayer."

It was narrated that Usaid bin Hudair said: "The Messenger of Allah (ﷺ) said: 'Do not perform ablution after (drinking) sheep's milk, but perform ablution after (drinking) camel's milk.'"

'Abdullah bin 'Amr said: "I heard the Messenger of Allah (ﷺ) say: 'Perform ablution after (eating) camel meat, but do not perform ablution after (eating) mutton. Perform ablution after (drinking) camel's milk, but do not perform ablution after (drinking) sheep's milk. Perform prayer in the sheep pens but not do in the camels' Ma'atin.'"

'Urwah bin Az-Subair narrated from 'Aishah, that: The Messenger of Allah (ﷺ) kissed one of his women (i.e., wives), then he went to perform the prayer, and he did not perform ablution. I ('Urwah bin Zubair) said: "That was not anyone but you,' and she smiled."

It was narrated that 'Ali said: "The Messenger of Allah (ﷺ) was asked about prostatic fluid and he said: 'For that ablution (is necessary), and for semen, bath is necessary.'"

It was narrated from Miqdad bin Aswad that: He asked the Prophet (ﷺ) about a man who approached his wife, but did not ejaculate. He said: "If anyone of you finds that, he should sprinkle water over his private part (meaning he must wash it) and perform ablution."

It was narrated from Ibn 'Abbas that: He came to Ubayy bin Ka'b accompanied by 'Umar. Ubayy came out to them and said: "I noticed some prostatic fluid, so I washed my penis and performed ablution. 'Umar said: "Is that sufficient?" He said: "Yes." He ('Umar) asked: "Did you hear that from the messenger of Allah?" He said: "Yes."

It was narrated from Ibn 'Abbas that: The Prophet (ﷺ) got up during the night and went to the toilet and relieved himself, then he washed his face and hands, and went back to sleep. (Sahih) Another chain with similar wording.

It was narrated that Abu Ghutaif Al-Hudhali said: "I was listening to 'Abdullah bin 'Umar bin Khattab in the mosque, and when the time for prayer came, he got up, performed ablution, and offered prayer, then he went back to where he had been sitting. When the time for 'Asr (Afternnon prayer) came, he got up, performed ablution, and offered prayer, then he went back to where he had been sitting. When the time for Maghrib (Sunset prayer) came, he got up, performed ablution, and offered prayer, then he went back to where he had been sitting. I said: 'May Allah improve you (i.e., your condition) Is it obligatory or Sunnah to perform ablution for every prayer?' He said: 'Did you notice that?' I said: 'Yes.' He said: 'No (it is not obligatory). If I perform ablution for Morning prayer I can perform all of the prayers with this ablution, so as long as I do not get impure. But I heard the Messenger of Allah (ﷺ) say: "Whoever performs ablution while he is pure, he will have ten merits." So I wanted to earn the merits.'"

'Abbad bin Tamim narrated that his paternal uncle said: "A complaint was made to the Prophet (ﷺ) about a man who sensed something (some doubt about his ablution) during prayer. He said: 'No (he does not have to perform ablution) unless he notices a smell or hears a sound.'"

It was narrated that Abu Sa'eed Al-Khudri said: "The Prophet (ﷺ) was asked about doubts (concerning ablution) during prayer. He said: 'he should not leave until he hears a sound or detects an odor.'"

It was narrated that Abu Hurairah said: "The Messenger of Allah (ﷺ) said: 'No ablution (is needed) unless there is an odor or a sound.'"

It was narrated that 'Amr bin 'Ata' said: "I saw Sa'ib bin Yazid sniffing his garment, and I said: 'Why (are you doing) that?' He said: 'I heard the Messenger of Allah (ﷺ) say: "No ablution (is needed) unless there is an odor or a sound."

It was narrated from 'Ubaidullah bin 'Abdullah bin 'Umar that his father said: "I heard the Messenger of Allah (ﷺ) being asked about water in the wilderness that is frequented by beasts and predators. The Messenger of Allah (ﷺ) said: "If the water reaches the amount of two Qullah, nothing can make it impure (Najis).'" (Sahih) Another chain with similar wording.