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.
Sunan Abi Dawud Book 31, Hadith 38
← Previous Hadith If anyone emancipates a slave who has property, the property of the slave belongs to him except that the master makes a stipulation.

Sunan Abi Dawud Book 31, Hadith 37 Next Hadith → Al-Arif ibn ad-Daylami said: We went to Wathilah ibn al-Asqa and said to him: Tell us a tradition which has not addition or omission. He became angry and replied: One of you recites when his copy of a Qur'an is hung up in his house, and he makes additions and omissions. We said: All we mean is a tradition you have heard from the Messenger of Allah (ﷺ). He said: We went to the Prophet (ﷺ) about a friend of ours who deserved. Hell for murder. He said: Emancipate a slave on his behalf; Allah will set free from Hell a member of the body for every member of his.

Sunan Abi Dawud Book 31, Hadith 39