Narrated Abu Bakr bin `Abdur-Rahman: My father and I went to `Aisha and she said, "I testify that Allah's Apostle at times used to get up in the morning in a state of Janaba from sexual intercourse, not from a wet dream and then he would fast that day."
Hadith Referenceصحيح البخاري / كتاب الصوم / 1931
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة
´Abu Bakr Bin Abdur-Rahman bin Al-Harith bin Hashim said:` "Aishah and Umm Salamah, the wives of the Prophet informed me that the Prophet would find that it was Fajr while he was Junub from (relations with) his wives, then he would perform Ghusl and fast."
Shaykh Dr. Abdur Rahman Freywai
English Commentary: 1: The hadith of Umm al-Mu’minin A’ishah and Umm al-Mu’minin Umm Salamah (radi Allahu anhuma) is in opposition to the hadith of Abu Hurairah: “Whoever enters the morning in a state of major ritual impurity (junub), then there is no fast for him.” The answer given is that the hadith of A’ishah and Umm Salamah is given preference over the hadith of Abu Hurairah because both of them are among the wives of the Prophet (sallallahu alayhi wa sallam), and wives are more knowledgeable about the conditions of their husbands. Secondly, Abu Hurairah is alone (in narrating), while these are two, and the narration of two is given preference over the narration of one.
Source: Sunan al-Tirmidhi – Majlis ‘Ilmi Dar al-Da‘wah, New Delhi Edition, Page: 779
Narrated Aishah and Umm Salamah, wives of the Prophet ﷺ: The Messenger of Allah ﷺ would be overtaken by the dawn when he was in a state of sexual defilement. The narrator Abdullah al-Adhrami said in his version: During Ramadan, due to sexual intercourse and no owing to a dream (i. e. nocturnal emission), and would fast. Abu Dawud said: How brief is this sentence uttered by the narrator, this is, "he was overtaken by daw when he was in the state of sexual defilement"? The tradition says: The Prophet ﷺ was overtaken by dawn in the state of sexual defilement when he was fasting.
Shaykh Umar Farooq Saeedi
Benefits and Issues: If a person begins the fast in a state of major ritual impurity (janabah) during the early hours of true dawn (fajr sadiq), there is no harm in this, provided that he performs the ritual bath (ghusl) in due time and joins the prayer. However, without a valid Shar‘i excuse, deliberately prolonging this state is impermissible and is considered a defect in the fast. This ruling applies equally to both men and women.
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 2388