[Machine] The Messenger of Allah ﷺ said, "During the custody of the slave, there are three nights." Sa'id said, "I asked Qatadah, 'How does this happen?'" He replied, "If the buyer finds a defect in the merchandise, he can return it within those days without asking for proof. However, after those days pass, he can only return it with proof that he bought it and that defect was present. Otherwise, the seller can swear that he did not sell it, and that is his defense." Sa'id and Hammam reported this narration from Qatadah, and likewise Yunus ibn 'Ubaid from Al-Hasan.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «فِي عُهْدَةِ الرَّقِيقِ ثَلَاثُ لَيَالٍ» قَالَ سَعِيدٌ فَقُلْتُ لِقَتَادَةَ كَيْفَ يَكُونُ هَذَا؟ قَالَ إِذَا وَجَدَ الْمُشْتَرِي عَيْبًا بِالسِّلْعَةِ فَإِنَّهُ يَرُدُّهَا فِي تِلْكَ الْأَيَّامِ وَلَا يَسْأَلُ الْبَيِّنَةَ فَإِذَا مَضَتْ عَلَيْهِ أَيَّامٌ فَلَيْسَ لَهُ أَنْ يَرُدَّهَا إِلَّا ببَيِّنَةٍ أَنَّهُ اشْتَرَاهَا وَذَلِكَ الْعَيْبُ بِهَا وَإِلَّا فَيَمِينُ الْبَائِعِ أَنَّهُ لَمْ يَبِعْهُ وَبِهِ دَاءٌ هَكَذَا قَالَ سَعِيدٌ وَهَمَّامٌ عَنْ قَتَادَةَ وَكَذَلِكَ رَوَاهُ يُونُسُ بْنُ عُبَيْدٍ عَنِ الْحَسَنِسكت عنه الذهبي في التلخيص