Musnad Abu Ya'la al-Mawsili 106:78

Muhammad narrated to us, Yahya narrated to us, from Sufyan, from Abu Ishaq, from al-Bara’ who said: A silk garment was gifted to the Messenger of Allah, may Allah bless him and grant him peace, and his companions began touching it. He said: "Do you marvel at the softness of this? The handkerchiefs of Sa'd in Paradise are softer than this."