Sahih Muslim
The Book Pertaining to Clothes and Decoration (Kitab Al-Libas wal-Zinah)
Book Number: 024 / Hadith Number: 5176
'Ali b. Abu Talib reported that Allah's Messenger (may peace be upon him) forbade wearing of silk and yellow clothes, and the gold ring, and the reciting of the Qur'an in the ruku' (state of kneeling in prayer).