حَدَّثَنَا وَهْبُ بْنُ بَقِيَّةَ، عَنْ خَالِدٍ، عَنْ دَاوُدَ، عَنْ بَكْرٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم بَعَثَ أَبَا ذَرٍّ بِهَذَا الْحَدِيثِ ‏.‏ قَالَ أَبُو دَاوُدَ وَهَذَا أَصَحُّ الْحَدِيثَيْنِ ‏.‏

Bakr said: The Prophet (PBUH) sent Mu`adh for some of his work. He then transmitted the rest of the tradition mentioned above. Abu Dawud said: This tradition is sounder of the two traditions. Translation Not Available

Book Ref: Sunan Abi Dawud Book 43 Hadith 4783
Web Ref:  Sunan Abi Dawud Book 42 Hadith 4765