It was narrated that 'Ubadah bin Samit said: "I taught people from Ahtus-Suffah" Qur'an and how to write, and one of them gave me a bow. I said: 'It is not money, and I can shoot (with it) for the sake of Allah., I asked the Messenger of Allah (ﷺ) about it and he said: 'If it would please you to have a necklace of fire placed around your neck, then accept it.'"
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، وَمُحَمَّدُ بْنُ إِسْمَاعِيلَ، قَالاَ حَدَّثَنَا وَكِيعٌ، حَدَّثَنَا مُغِيرَةُ بْنُ زِيَادٍ الْمَوْصِلِيُّ، عَنْ عُبَادَةَ بْنِ نُسَىٍّ، عَنِ الأَسْوَدِ بْنِ ثَعْلَبَةَ، عَنْ عُبَادَةَ بْنِ الصَّامِتِ، قَالَ عَلَّمْتُ نَاسًا مِنْ أَهْلِ الصُّفَّةِ الْقُرْآنَ وَالْكِتَابَةَ فَأَهْدَى إِلَىَّ رَجُلٌ مِنْهُمْ قَوْسًا فَقُلْتُ لَيْسَتْ بِمَالٍ وَأَرْمِي عَنْهَا فِي سَبِيلِ اللَّهِ فَسَأَلْتُ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ عَنْهَا فَقَالَ " إِنْ سَرَّكَ أَنْ تُطَوَّقَ بِهَا طَوْقًا مِنْ نَارٍ فَاقْبَلْهَا " .
sunnah.com