Sahih Muslim
The Book Pertaining to the Merits of the Companions (Allah Be Pleased With Them) of the Holy Prophet (May Peace Be Upon Him) (Kitab Al-Fadail Al-Sahabah)
Book Number: 031 / Hadith Number: 6038
This hadith has been reported on the authority of Shu'ba combining the two chains of transmitters. Anas b Malik reported that Allah's Messenger (may peace be upon him) was presented a garment of sundus and he prohibited the use of silk. The persons admired it, whereupon he said: By Him in Whose Hand is the life of Muhammad, the kerchiefs of Sa'd b. Mu'adh in Paradise are better than this.