Musannaf Ibn Abi Shaybah

Hazrat Hakam narrates that a man left a slave woman for his wife and his son. His wife and son sold her that slave woman. The buyer had had intercourse with the slave woman and she bore children. After that, the owner of the slave woman came and wanted to reclaim the slave woman the slave woman. This case was presented before Hazrat Ali (may Allah be pleased with him). Hazrat Ali (may Allah be pleased with him) said to him, "Your wife and your son have sold her your slave woman, and the buyer has also had a child with her. You should let the sale stand." He said, "I adjure you by Allah, you have not judged according to the Book of Allah." Hazrat Ali (may Allah be pleased with him) said to that man, "Take your slave woman and her child." Then he said to the other man, "Take khulas from the woman and her son." When compensation was taken from them, the other man handed over the sale.

* From Hadith number 20647, the meaning of khulas (khulas) is understood to be that if a person sells something and the buyer starts using it, then if a rightful owner appears for that thing, the original price of the thing will also be taken from the seller and, to settle the dispute, additional damages will also be collected.