Sayyiduna Uqbah bin Amir (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "There is no guarantee against a slave's defects beyond four days."
This hadith revolves around al-Hasan from Uqbah bin Amir, and it is mursal; Ali bin Abdullah al-Madini said: Al-Hasan did not hear anything from Uqbah bin Amir.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10755