Chapter: The virtue of manumitting one's father
Abu Huraira (Allah be pleased with him) reported Allah's Messenger ( صلی اللہ علیہ وسلم ) as saying: A son does not repay what he owes his father unless he buys him (the father) in case he is a slave and then emancipates him. In the narration transmitted by Ibn Abu Shaiba there is a slight change of words.
Authentic