Musnad Ahmad 30:2049

Mu'awiyah narrated to us, he said: Abu Ishaq narrated to us, from al-A'mash, from Abu Salih, from Abu Hurayrah, from the Prophet, peace and blessings of Allah be upon him, who said: "You will find among the worst of people on the Day of Resurrection the one who comes to these with the speech of these, and to these with the speech of these."