Sahih Bukhari
Merits of the Helpers in Madinah (Ansaar)
Volume: 005 / Book Number: 058 / Hadith Number: 146
Narrated Al-Bara:
A silken cloth was given as a present to the Prophet . His companions started touching it and admiring its softness. The Prophet said, "Are you admiring its softness? The handkerchiefs of Sad bin Muadh (in Paradise) are better and softer than it."