from Ibn 'Umar who said: "I heard 'Umar mentioning that the Prophet ﷺ said: 'Whoever wears silk in the world he shall not wear it in the Hereafter.'"  

أَنَّ النَّبِيَّ ﷺ قَالَ مَنْ لَبِسَ الْحَرِيرَ فِي الدُّنْيَا لَمْ يَلْبَسْهُ فِي الآخِرَةِ وَفِي الْبَابِ عَنْ عَلِيٍّ وَحُذَيْفَةَ وَأَنَسٍ وَغَيْرِ وَاحِدٍ وَقَدْ ذَكَرْنَاهُ فِي كِتَابِ اللِّبَاسِ