Musannaf Ibn Abi Shaybah 39086 — A slave's wealth when he is sold: Abu

Abdullah bin Abi Bakr narrates: I heard Aban bin Uthman and Hisham bin Isma'il teaching about the 'uhdah on a slave: for fever and (an ailment of) the belly there is an option of three days, and for insanity and leprosy an option of one year. It is mentioned that the view of (Imam) Abu Hanifah is: When the two contracting parties have separated, they no longer have the right to return the sold item unless there is a defect.