Musnad Ahmad 28:369

Isma'il narrated to us, Dawud ibn Abi Hind narrated to us, from 'Amr ibn Shu'ayb, from his father, from his grandfather: That a group of people were sitting at the door of the Prophet, peace and blessings of Allah be upon him. Some of them said, "Did Allah not say such and such?" And others said, "Did Allah not say such and such?" The Messenger of Allah, peace and blessings of Allah be upon him, heard that, so he came out as if pomegranate seeds had been crushed upon his face [in anger]. He said, "Is this what you were commanded with? Or is this what you were sent with? That you should strike parts of the Book of Allah against other parts? The nations before you only went astray because of this." "You have no part in what is here. Look at what you have been commanded to do, and act upon it; and what you have been forbidden from, then refrain from it."