Sunan Abu Dawud
366
Sahih+3

Narrated Umm Habibah: Mu'awiyah ibn AbuSufyan asked his sister Umm Habibah, the wife of the Prophet (ﷺ): Would the apostle of Allah (ﷺ) pray in the clothe in which he had an intercourse? She said: Yes, when he would not see any impurity in it

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid