Sayyiduna Uqbah bin Amir (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "The guarantee against a slave's defects lasts three nights."
Sa'id (may Allah have mercy on him) said: I asked Qatadah (may Allah have mercy on him): How is that? He said: If the buyer finds a defect in the goods and returns them within those three days, he will not even be asked for proof. But after the three days have passed, proof will be required that he bought it from him and the defect was present at that time; otherwise the seller will swear an oath that this disease was not in it at the time of sale.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10752
Sayyiduna Uqbah bin Amir (may Allah be pleased with him) narrates from the Prophet (peace and blessings be upon him): "The guarantee against a slave's defects lasts four nights."
Hisham said: Qatadah said: The people of Madinah mention three nights.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10753
Sayyiduna Samurah or Uqbah (may Allah be pleased with them) narrates from the Prophet (peace and blessings be upon him) that he (peace and blessings be upon him) said: "The guarantee against a slave's defects is four days."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10754
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
Ali bin Abdullah al-Madini said this (that al-Hasan did not hear from Uqbah), and likewise a group of the imams of transmission said it.
Imam al-Shafi'i (may Allah have mercy on him) said: The report that the Prophet (peace and blessings be upon him) gave Habban bin Munqidh (may Allah be pleased with him) a three-day guarantee against defects was specific (to him).
Ata (may Allah have mercy on him) said: In the past there was no guarantee period anywhere in the land, neither for hiyam (a disease of raging thirst), nor for leprosy, nor for anything else. I said to him: Were there not three days? He said: No; when it is sold sound, there is no guarantee. If Allah later brings about some disease, that is as He wills. But if it is proven that this disease existed before the sale, then there is a guarantee; and the matter still runs this way.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10756