Sahih Bukhari Volume 4, Book 61, Hadith 3494

حَدَّثَنِي إِسْحَاقُ بْنُ إِبْرَاهِيمَ، أَخْبَرَنَا جَرِيرٌ، عَنْ عُمَارَةَ، عَنْ أَبِي زُرْعَةَ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ تَجِدُونَ النَّاسَ مَعَادِنَ، خِيَارُهُمْ فِي الْجَاهِلِيَّةِ خِيَارُهُمْ فِي الإِسْلاَمِ إِذَا فَقِهُوا، وَتَجِدُونَ خَيْرَ النَّاسِ فِي هَذَا الشَّأْنِ أَشَدَّهُمْ لَهُ كَرَاهِيَةً ‏"‏‏

Narrated By Abu Huraira : Allah's Apostle said, "You see that the people are of different natures. Those who were the best in the Pre-Islamic period, are also the best in Islam if they comprehend religious knowledge. You see that the best amongst the people in this respect (i.e. ambition of ruling) are those who hate it most.