I heard 'Umar bin al-Khattab ؓ say in his khutbah that he heard the Messenger of Allah ﷺ say: ʿ Whoever wears silk in this world will not be clothed with it in the Hereafter.ʿ
أَنَّهُ سَمِعَ مِنْ رَسُولِ اللهِ ﷺ يَقُولُ مَنْ يَلْبَسِ الْحَرِيرَ فِي الدُّنْيَا فَلا يُكْسَاهُ فِي الْآخِرَةِ