'A'isha, the wife of the Apostle of Allah (ﷺ) , said: The dawn broke upon the Messenger of Allah (ﷺ) during the Ramadan in a state of junub not because of sexual dream (but on account of intercourse) and he washed himself and observed fast.
Hadith ReferenceSahih Muslim / The Book of Fasting / Hadith: 1109