(1) باب مَا جَاءَ فِي الْحَرِيرِ وَالذَّهَبِ
Narrated Suwaid bin Ghafalah:
That 'Umar gave a Khutbah at Al-Jabiyah and he said: "The Messenger of Allah (ﷺ) prohibited silk except for two finger's worth of space, or three, or four."[Abu 'Eisa said:] This Hadith is Hasan Sahih.
Reference: Jami` at-Tirmidhi 1721
In-book reference: Book 24, Hadith 2
English translation: Vol. 3, Book 22, Hadith 1721