ENOfficial
Ibn ‘Umar reported God’s messenger as saying, “Only he who has no portion in the next world wears silk in this world." (Bukhari and Muslim.)
Source: sunnah.com
Other translations
Arabic
وَعَنِ ابْنِ عُمَرَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «إِنَّمَا يَلْبَسُ الْحَرِيرَ فِي الدُّنْيَا مَنْ لَا خَلَاقَ لَهُ فِي الْآخِرَة»
sunnah.com