Musannaf Ibn Abi Shaybah 24671 — What a sale may be returned for

It is narrated from Muhammad (Ibn Sirin) (may Allah have mercy on him) that a man sold his slave who had a cauterisation mark at his hairline, but he concealed this defect. When the buyer learned of the defect, he took the case to Shurayh. Shurayh said: "You concealed the defect and covered it up." So he did not uphold the sale and ordered the slave to be returned.