Musannaf Ibn Abi Shaybah

Ibrahim says that if a person finds a defect in the molar of an animal after purchasing it and wants to return it, he will swear that he is returning it because of the defect in the molar, and if there is any other defect besides this, then he will not swear.

It is narrated from Hazrat Ali (may Allah be pleased with him) by Ibn Mudrik al-Nakha'i that a man bought a slave girl from another, and she did not have a molar tooth. He took the dispute to Hazrat Shurayh (may Allah have mercy on him). Hazrat Shurayh said: Present witnesses to prove that he sold you the slave girl without a molar tooth; otherwise, he will swear an oath that he sold her to you and she had a molar tooth.