Abu Dawud Book 27, Hadith Number 4033.
Chapter : The view that disapproves of wearing silk.
Narated By N/A : ‘Ali b. Abi Talib (Allah be pleased with him) said: The Apostle of Allah (may peace be upon him) forbade us to wear a Qassi garment, a garment dyed with safflower, gold rings, and reading the Qur’an while bowing.