Musnad Abu Ya'la al-Mawsili 133:3

Ibrahim ibn al-Hajjaj narrated to us, Hammad narrated to us, from Ali ibn Zayd, from Anas ibn Malik: That the King of Rome gifted the Prophet, may Allah bless him and grant him peace, a garment of silk (sundus). The Prophet, may Allah bless him and grant him peace, wore it, and it is as if I am looking at its sleeves swaying. His companions said, "O Messenger of Allah, was this sent down to you from the heaven?" The Messenger of Allah, may Allah bless him and grant him peace, said, "By the One in Whose hand is my soul, a handkerchief from the handkerchiefs of Sa'd ibn Mu'adh in Paradise is better than this." He then sent it to Ja'far, and Ja'far wore it. He (the Prophet) said, "I did not send it to you so that you would wear it." He said, "Then what should I do with it?" He said, "Send it to your brother, the Negus."