Jami` at-Tirmidhi, Volume 6, Book 44, Hadith 3321 (DarusSalam) ⓘ
Abdur-Rahman bin Abdullah bin Sa’d Ar-Razi [and he is Ad-Dashtaki] narrated : that his father informed him, that his father – may Allah have mercy upon him – informed him, he said: “I saw a man in Bukhara upon a mule wearing a black Imamah, saying: ‘It was given to me by the Messenger of Allah.’”
حَدَّثَنَا مُحَمَّدُ بْنُ حُمَيْدٍ الرَّازِيُّ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ عَبْدِ اللَّهِ بْنِ سَعْدٍ، عَنْ وَالِدِهِ عَبْدِ اللَّهِ بْنِ سَعْدٍ، . حَدَّثَنَا يَحْيَى بْنُ مُوسَى، حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ عَبْدِ اللَّهِ بْنِ سَعْدٍ الرَّازِيُّ، وَهُوَ الدَّشْتَكِيُّ أَنَّ أَبَاهُ، أَخْبَرَهُ أَنَّ أَبَاهُ رَحِمَهُ اللَّهُ أَخْبَرَهُ كَذَا، قَالَ أَخْبَرَهُ قَالَ رَأَيْتُ رَجُلاً بِبُخَارَى عَلَى بَغْلَةٍ وَعَلَيْهِ عِمَامَةٌ سَوْدَاءُ وَيَقُولُ كَسَانِيهَا رَسُولُ اللَّهِ صلى الله عليه وسلم .
also referenced under: Hadith 3321 (Reference) & Book 47, Hadith 3639 (In-Book)