Sahih al-Bukhari 7331
Sahih al-Bukhari · Book 96: Holding Fast to the Qur'an and Sunnah · The religious learned men should not differ
Narrated Anas bin Malik:
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ ، عَنْ مَالِكٍ ، عَنْ إِسْحَاقَ بْنِ عَبْدِ اللَّهِ بْنِ أَبِي طَلْحَةَ ، عَنْ أَنَسِ بْنِ مَالِكٍ ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " اللَّهُمَّ بَارِكْ لَهُمْ فِي مِكْيَالِهِمْ، وَبَارِكْ لَهُمْ فِي صَاعِهِمْ وَمُدِّهِمْ " يَعْنِي أَهْلَ الْمَدِينَةِ.
Allah's Messenger (ﷺ) said, "O Allah! Bestow Your Blessings on their measures, and bestow Your Blessings on their Sa' and Mudd." He meant those of the people of Medina.