Musnad Abu Ya'la al-Mawsili 106:77

And with his chain of narration from Abu Ishaq, he said: I heard al-Bara’ saying: A silk garment was gifted to the Messenger of Allah (may Allah bless him and grant him peace), and his companions began touching it, marveling at its softness. He said: "Do you marvel at the softness of this? The handkerchiefs of Sa'd in Paradise are better than it, and softer."