Sahih Muslim 222
Sahih Muslim · Book 1: The Book of Faith · Allah will say to Adam: "Bring out the Portion of the Fire; Nine Hundred and Ninety-Nine Out of Every Thousand."
The same hadith has been narrated from A'mash on the authority of the same chain of transmitters with the exception of these words:
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ ، حَدَّثَنَا وَكِيعٌ ، ح وَحَدَّثَنَا أَبُو كُرَيْبٍ ، حَدَّثَنَا أَبُو مُعَاوِيَةَ ، كِلاَهُمَا عَنِ الأَعْمَشِ ، بِهَذَا الإِسْنَادِ غَيْرَ أَنَّهُمَا قَالاَ " مَا أَنْتُمْ يَوْمَئِذٍ فِي النَّاسِ إِلاَّ كَالشَّعْرَةِ الْبَيْضَاءِ فِي الثَّوْرِ الأَسْوَدِ أَوْ كَالشَّعْرَةِ السَّوْدَاءِ فِي الثَّوْرِ الأَبْيَضِ " . وَلَمْ يَذْكُرَا " أَوْ كَالرَّقْمَةِ فِي ذِرَاعِ الْحِمَارِ " .
You would be no more among men (on the Day of Resurrection) but like a white hair on (the body of) a black ox, or like a black hair on (the body of) a white ox, and he made no mention of: a strip on the foreleg of an ass.