(2) باب تَحْرِيمِ اسْتِعْمَالِ إِنَاءِ الذَّهَبِ وَالْفِضَّةِ عَلَى الرِّجَالِ وَالنِّسَاءِ وَخَاتَمِ الذَّهَبِ وَالْحَرِيرِ عَلَى الرَّجُلِ وَإِبَاحَتِهِ لِلنِّسَاءِ وَإِبَاحَةِ الْعَلَمِ وَنَحْوِهِ لِلرَّجُلِ مَا لَمْ يَزِدْ عَلَى أَرْبَعِ أَصَابِعَ
Abu Umama reported Allah's Messenger (ﷺ) having said:
He who wore silk in this world would not wear it in the Hereafter.
Reference: Sahih Muslim 2074
In-book reference: Book 37, Hadith 41
USC-MSA web (English) reference(deprecated numbering scheme): Book 24, Hadith 5165