Musnad Abu Ya'la al-Mawsili 243:113

Ishaq ibn Abi Isra'il narrated to us, al-Nadr ibn Shumayl narrated to us, Shu'bah or Sa'id narrated to us, from Ghalib al-Tammar, from Humayd ibn Hilal, from Masruq ibn Aws, that Abu Musa narrated to him: That the Messenger of Allah (may Allah bless him and grant him peace) decreed for the fingers ten [camels] for each [finger].