Sayyiduna Tufail bin Amr (may Allah be pleased with him) said: Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) taught me the Qur'an, so I gifted him a bow. Then, in the morning, he came to the Messenger of Allah (peace and blessings be upon him) while he was wearing that bow. The Messenger of Allah (peace and blessings be upon him) asked: "Who gave you this weapon?" Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) replied: "Tufail bin Amr (may Allah be pleased with him) did; I had taught him the Qur'an." Upon this, the Messenger of Allah (peace and blessings be upon him) said: "You have hung a piece of the fire of Hell around your neck." The Companions (may Allah be pleased with them) said: "O Messenger of Allah (peace and blessings be upon him)! We also eat their food?" He (peace and blessings be upon him) said: "If food is prepared for others and you are present there, then there is no harm in eating it, but if it is made especially for you, then you are eating it only in exchange for your (religious) work (reward)."