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.
In-book : Book 14, Hadith 76
English translation : Book 13, Hadith 2382