The Book of Clothes and Adornment
37/2. Chapter:
The Prohibition Of Using Vessels Of Gold And Silver For Men And Women, And Gold Rings And Silk For Men, But They Are Permissible For Women. Permissibility Of Silken Borders On Garments For Men, But It Should Not Be More Than Four Fingers Wide
Sahih Muslim
حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ عُمَرَ الْقَوَارِيرِيُّ، وَأَبُو غَسَّانَ الْمِسْمَعِيُّ وَزُهَيْرُ بْنُ حَرْبٍ وَإِسْحَاقُ بْنُ إِبْرَاهِيمَ وَمُحَمَّدُ بْنُ الْمُثَنَّى وَابْنُ بَشَّارٍ - قَالَ إِسْحَاقُ أَخْبَرَنَا وَقَالَ الآخَرُونَ، حَدَّثَنَا - مُعَاذُ بْنُ هِشَامٍ، حَدَّثَنِي أَبِي، عَنْ قَتَادَةَ، عَنْ عَامِرٍ الشَّعْبِيِّ، عَنْ سُوَيْدِ بْنِ غَفَلَةَ، أَنَّ عُمَرَ، بْنَ الْخَطَّابَ خَطَبَ بِالْجَابِيَةِ فَقَالَ نَهَى نَبِيُّ اللَّهِ صلى الله عليه وسلم عَنْ لُبْسِ الْحَرِيرِ إِلاَّ مَوْضِعَ إِصْبَعَيْنِ أَوْ ثَلاَثٍ أَوْ أَرْبَعٍ .
Suwaid b. Ghafala said: 'Umar addressed us at a place known as Jabiya (Syria) and he said: Allah's Apostle (ﷺ) forbade us the wearing of silk but to the extent of two or three fingers or four fingers.
Reference : Sahih Muslim 2069iIn-book reference : Book 37, Hadith 32USC-MSA web (English) reference : Book 24, Hadith 5156