Musnad Abu Ya'la al-Mawsili 117:39

Ibrahim ibn al-Hajjaj narrated to us, Hammad narrated to us, from Thabit, that they said to Anas: "Did the Messenger of Allah (ﷺ) have a ring?" He said: "The Messenger of Allah (ﷺ) delayed the Isha prayer one night until half of the night had passed, or almost half of the night had passed. Then he came and said: 'The people have prayed, and you will remain in a state of prayer as long as you are waiting for the prayer.'" Anas said: "It is as if I am looking at the glimmer of his silver ring." And Anas raised his left hand to show us.