کتاب الفتن · نُعیم بن حماد

No one escapes from them except a good tidings and a warner. As for the good tidings, he comes to the Mahdi in Mecca and his companions and informs them of what happened to them, and the witness of that is in his face with his face turned to his back, and they believe him when they see the turning of his face, and they know that the people have been eclipsed by them, and the second is like that, he has turned his face to his back. The Sufyani comes and tells him what was revealed to his companions and he believes it and knows that it is true because of the sign he sees in it, and they are two men of a dog.