Musnad Ahmad 435:109

Abu al-Mughirah narrated to us, he said: Safwan narrated to us, he said: Abu al-Zahiriyah narrated to us, from Mu'awiyah ibn Abi Sufyan, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "I am only a conveyor, and Allah is the One who guides. And I am a distributor, and Allah is the One who gives. So whoever receives something from me with a good desire and good guidance, then that is the one for whom it is blessed. And whoever receives something from me with an evil desire and evil guidance, then that is the one who eats and is not satisfied."