Musnad Ahmad 32:1994

Abu Dawud narrated to us, Shu'bah informed us, from Qatadah, from Anas, that the Prophet, peace and blessings of Allah be upon him, was brought a garment of silk. They began to touch it and look at it. He said: "Do you marvel at this? The handkerchiefs of Sa'd ibn Mu'adh in Paradise are better than this," or "softer than this," or he said: "a handkerchief."