Sayyiduna Mu'awiyah (may Allah be pleased with him) narrates from the Prophet (peace and blessings be upon him) that he (peace and blessings be upon him) said: "I am only a conveyor, and it is Allah who guides; and I am a distributor, and it is Allah who gives. So whoever receives something from me in a good manner and with eagerness, it is blessed for him; and whoever receives something in a bad manner and with ill desire, his example is that of one who eats but is never satisfied."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16963
Abu Hazzan Atiyyah bin Abi Jamilah narrated this hadith and attributed it to Sayyiduna Mu'awiyah bin Abi Sufyan (may Allah be pleased with him), and Sayyiduna Mu'awiyah (may Allah be pleased with him) attributes it to the Messenger of Allah (peace and blessings be upon him), who said: "I am only a conveyor, and it is Allah who guides; and I am only a distributor, and it is Allah who gives. So whoever receives something from us in a good manner and with good desire, it is blessed for him; and whoever receives something from us in a bad manner and with ill desire, his example is that of one who eats but is never satisfied."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16964