Sunan Ibn Majah
1704
Sahih+3

It was narrated that Nafi’ said:“I asked Umm Salamah about a man who gets up in the morning when he is in a state of sexual impurity and wants to fast. She said: “The Messenger of Allah (ﷺ) used to get up in the morning in a state of sexual impurity after having intercourse, not from a wet dream, then he would take a bath and complete his fast.’”

SahihAl-Albani
SahihMuhammad Fouad Abd al-Baqi