The Book of Faith
1/21. Chapter:
People excel over one another in faith, and the superiority of the people of Yemen in faith
Sahih Muslim
وَحَدَّثَنَا عَبْدُ اللَّهِ بْنُ عَبْدِ الرَّحْمَنِ الدَّارِمِيُّ، أَخْبَرَنَا أَبُو الْيَمَانِ، أَخْبَرَنَا شُعَيْبٌ، عَنِ الزُّهْرِيِّ، بِهَذَا الإِسْنَادِ مِثْلَهُ وَزَادَ " الإِيمَانُ يَمَانٍ وَالْحِكْمَةُ يَمَانِيَةٌ " .
The same hadith has been narrated by Zuhri with the same chain of authorities with the addition: The belief is among the Yemenites, the sagacity is that of the Yemenites.
Reference : Sahih Muslim 52gIn-book reference : Book 1, Hadith 95USC-MSA web (English) reference : Book 1, Hadith 90