جامع الترمذي

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.