It is narrated from Hazrat Ubadah (may Allah be pleased with him) that the Holy Prophet (peace and blessings of Allah be upon him) was often occupied, so whenever any man from among the Muhajireen came to the Holy Prophet (peace and blessings of Allah be upon him), he would entrust him to one of us to teach him the Qur'an. Once, the Holy Prophet (peace and blessings of Allah be upon him) entrusted a man to me. He stayed with me in my house, I included him in the food of my family, and I also taught him the Qur'an. When he was about to return to his home, he thought in his heart that I had some right over him, so he presented me with a bow as a gift, the wood and smoothness of which I had never seen better before. I went to the Holy Prophet (peace and blessings of Allah be upon him) and asked about it, "O Messenger of Allah! What is your opinion about this?" The Holy Prophet (peace and blessings of Allah be upon him) said, "It is a burning coal that you have hung between your shoulders."