Sahih Bukhari
Holding Fast to the Quran and Sunnah
Volume: 009 / Book Number: 092 / Hadith Number: 431
Narrated Anas bin Malik:
Allah's Apostle 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.