I heard ʿUmar saying, "The Prophet ﷺ said, 'Whoever wears silk in this world, shall not wear it in the Hereafter." This hadith is also narrated through 'Umar ibn al-Khattab. (Using translation from Bukhārī 5834)
قَالَ رَسُولُ اللهِ ﷺ «مَنْ لَبِسَ الْحَرِيرَ فِي الدُّنْيَا لَمْ يَلْبَسْهُ فِي الْآخِرَةِ»