From Sahih Muslim (Hadith 6348):
Al-Bara' reported that a garment of silk was presented to Allah's Messenger (ﷺ). His Companions touched it and admired its softness; there- upon he said:Do you admire the softness of this (cloth)? The handkerchiefs of Sa'd b. Mu'adh in Paradise are better than this
Reference: Muslim 6348