Sahih Bukhari Volume 7, Book 72, Hadith Number 727.

Narrated By Al-Bara : The Prophet was given a silk garment as a gift and we started touching it with our hands and admiring it. On that the Prophet said, “Do you wonder at this?” We said, “Yes.” He said, “The handkerchiefs of Sad bin Mu’adh in Paradise are better than this.”