Musnad Ahmad 32:1926

'Affan narrated to us, Hammad narrated to us, Thabit informed us, from Anas: "Usayd ibn Hudayr and 'Abbad ibn Bishr were with the Prophet, may Allah bless him and grant him peace, on a pitch-black night. They left from his presence, and the staff of one of them lit up, so they began walking in its light. When they parted ways, the staff of the other one lit up." Hammad also said: "When they parted ways, the staff of this one lit up, and the staff of that one lit up."