From Sahih Bukhari (Hadith 6640):
Narrated Al-Bara 'bin `Azib:A piece of silken cloth was given to the Prophet (ﷺ) as a present and the people handed it over amongst themselves and were astonished at its beauty and softness. Allah's Messenger (ﷺ) said, "Are you astonished at it?" They said, "Yes, O Allah's Messenger (ﷺ)!" He said, "By Him in Whose Hand my soul is, the handkerchiefs of Sa`d in Paradise are better than it
Reference: Bukhari 6640