Sahih Muslim 2080
Sahih Muslim · Book 37: The Book of Clothes and Adornment · Humility In Dress And Sticking To Coarse And Simple Clothes, Furnishings Etc., Permissibility Of Wearing Clothes Made From Camel Hair And Those On Which There Are Markings
وَحَدَّثَنِي مُحَمَّدُ بْنُ رَافِعٍ ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ ، أَخْبَرَنَا مَعْمَرٌ ، عَنْ أَيُّوبَ ، بِهَذَا الإِسْنَادِ مِثْلَهُ وَقَالَ إِزَارًا غَلِيظًا .
This hadith has been reported on the authority of Ayyub with a slight variation of wording.