The Prophet of Allah ﷺ took silk and held it in his right hand, and took gold and held it in his left hand and said: both of these are prohibited to the males of my community.

أَنَّهُ سَمِعَ عَلِيَّ بْنَ أَبِي طَالِبٍ ؓ يَقُولُ إِنَّ نَبِيَّ اللَّهِ ﷺ أَخَذَ حَرِيرًا فَجَعَلَهُ فِي يَمِينِهِ وَأَخَذَ ذَهَبًا فَجَعَلَهُ فِي شِمَالِهِ ثُمَّ قَالَ إِنَّ هَذَيْنِ حَرَامٌ عَلَى ذُكُورِ أُمَّتِي