"I taught a man the Qur'an, and he gave me a bow. I mentioned that to the Messenger of Allah ﷺ and he said: 'If you accept it you will be accepting a bow of fire.' So I returned it."
عَلَّمْتُ رَجُلاً الْقُرْآنَ فَأَهْدَى إِلَىَّ قَوْسًا فَذَكَرْتُ ذَلِكَ لِرَسُولِ اللَّهِ ﷺ فَقَالَ إِنْ أَخَذْتَهَا أَخَذْتَ قَوْسًا مِنْ نَارٍ فَرَدَدْتُهَا