Sahih al-Bukhari 5833
Sahih al-Bukhari · Book 77: Dress · The wearing of silk clothes by men
Narrated Thabit:
حَدَّثَنَا سُلَيْمَانُ بْنُ حَرْبٍ ، حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ ، عَنْ ثَابِتٍ ، قَالَ سَمِعْتُ ابْنَ الزُّبَيْرِ ، يَخْطُبُ يَقُولُ قَالَ مُحَمَّدٌ صلى الله عليه وسلم " مَنْ لَبِسَ الْحَرِيرَ فِي الدُّنْيَا لَمْ يَلْبَسْهُ فِي الآخِرَةِ " .
I heard Ibn Az-Zubair delivering a sermon, saying, "Muhammad said, 'Whoever wears silk in this world, shall not wear it in the Hereafter."