كتاب الإجارة
Read the English translation first, with the original Arabic directly underneath.
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 Messenger 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.
إِنْ كُنْتَ تُحِبُّ أَنْ تُطَوَّقَ طَوْقًا مِنْ نَارٍ فَاقْبَلْهَا