Sunan Abi Dawud 3507
سنن أبي داود#3507Da'ifحَدَّثَنَا هَارُونُ بْنُ عَبْدِ اللَّهِ، حَدَّثَنِي عَبْدُ الصَّمَدِ، حَدَّثَنَا هَمَّامٌ، عَنْ قَتَادَةَ، بِإِسْنَادِهِ وَمَعْنَاهُ زَادَ إِنْ وَجَدَ دَاءً فِي الثَّلاَثِ اللَّيَالِي رُدَّ بِغَيْرِ بَيِّنَةٍ وَإِنْ وَجَدَ دَاءً بَعْدَ الثَّلاَثِ كُلِّفَ الْبَيِّنَةَ أَنَّهُ اشْتَرَاهُ وَبِهِ هَذَا الدَّاءُ . قَالَ أَبُو دَاوُدَ هَذَا التَّفْسِيرُ مِنْ كَلاَمِ قَتَادَةَ .
The tradition mentioned above has also been transmitted by Qatadah through a different chain of narrators to the same effect. This version adds:"If he finds defect (in the slave) within three days, he may return it without evidence; if he finds a defect after three days, he will be required to produce evidence that he (the slave) had the defect when he bought it." Abu Dawud said: This explanation is from the words of Qatadah
Scholarly Authentication
The label above is the grade most of these scholars gave, each scholar counted once — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. When they judged only its chain of narrators (“Isnaad”), the label says “Sound chain”. Each scholar's own wording:
Our source also lists this ruling under Muhammad Muhyi Al-Din Abdul Hamid, the editor of the printed edition it was taken from. It is al-Albani's ruling printed again, so it is counted once.
In-book reference: 24:92