Hamzah (may Allah be pleased with him) narrates: We were on a journey with the Messenger of Allah (peace and blessings be upon him) when, on an extremely dark and pitch-black night, the mounts bolted. Then my fingers lit up, until the people gathered their mounts and their fallen belongings by their light, and my fingers were truly shining.
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 2978