From Sahih Bukhari (Hadith 3802):
Narrated Al-Bara:A silken cloth was given as a present to the Prophet (ﷺ) . His companions started touching it and admiring its softness. The Prophet (ﷺ) said, "Are you admiring its softness? The handkerchiefs of Sa`d bin Mu`adh (in Paradise) are better and softer than it
Reference: Bukhari 3802