Sahih Muslim 2074
Sahih Muslim · Book 37: The Book of Clothes and Adornment · The Prohibition Of Using Vessels Of Gold And Silver For Men And Women, And Gold Rings And Silk For Men, But They Are Permissible For Women. Permissibility Of Silken Borders On Garments For Men, But It Should Not Be More Than Four Fingers Wide
Abu Umama reported Allah's Messenger (ﷺ) having said:
وَحَدَّثَنِي إِبْرَاهِيمُ بْنُ مُوسَى الرَّازِيُّ ، أَخْبَرَنَا شُعَيْبُ بْنُ إِسْحَاقَ الدِّمَشْقِيُّ ، عَنِ الأَوْزَاعِيِّ ، حَدَّثَنِي شَدَّادٌ أَبُو عَمَّارٍ ، حَدَّثَنِي أَبُو أُمَامَةَ ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " مَنْ لَبِسَ الْحَرِيرَ فِي الدُّنْيَا لَمْ يَلْبَسْهُ فِي الآخِرَةِ " .
He who wore silk in this world would not wear it in the Hereafter.