People excel over one another in faith, and the superiority of the people of Yemen in faith Sahih Muslim 52 j

Arabic hadith text
وَحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، وَزُهَيْرُ بْنُ حَرْبٍ، قَالاَ حَدَّثَنَا جَرِيرٌ، عَنِ الأَعْمَشِ، بِهَذَا الإِسْنَادِ وَلَمْ يَذْكُرْ ‏"‏ رَأْسُ الْكُفْرِ قِبَلَ الْمَشْرِقِ ‏"‏ ‏.‏
Translation
Qutaiba b. Sa'id and Zubair b. Harb say

Jarir narrated this on the authority of A'mash with the same chain of narrators (as mentioned above).