Chapter 24: Wages (Kitab Al-Ijarah)
Narrated Ubaydah ibn as-Samit: I taught some persons of the people of Suffah writing and the Qur' an. A man of them presented to me a bow. I said: It cannot be reckoned property; may I shoot with it in Allah' s path? I must come to the Apostle of of Allah (ﷺ) and ask him (about it). So I came to him and said: Messenger of Allah (ﷺ), one of those whom I have been teaching writing and the Qur' an has presented me a bow, and as it cannot be reckoned property, may I shoot with it in Allah' s path? He said: If you want to have a necklace of fire on you, accept it.
Sunan Abi Dawud 3416