Musannaf Ibn Abi Shaybah

Hazrat Yasir bin Amr says that I mentioned to Hazrat Umar about the Ghilaan, who alter their appearance and mislead people from the path. So he said: Surely, nothing has the ability to alter Allah’s creation from the way Allah created it. But this deception is like your deception. When you see such a thing, then give the call to prayer (Adhan).