Musnad Ahmad 32:1477

Yunus narrated to us, Hammad—meaning Ibn Salamah—narrated to us, from Ali ibn Zayd, from Anas ibn Malik, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "When I was taken on the Night Journey, I passed by men whose lips were being clipped with scissors of fire." He said: "I asked, 'Who are these, O Gabriel?' He said, 'These are the preachers of your nation who command people to righteousness and forget themselves, while they recite the Book. Do they not then use their reason?'"