Sunan Abu Dawud
3963
Sahih+3

Narrated AbuHurayrah: The Prophet (ﷺ) said: The child of adultery is worst of the three. Abu Hurairah said: That I give a flog in the path of Allah (as a charity) is dearer to me than emancipating a child of adultery

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid