الكافي 1/4/124/16

16. Ishaq has said that Muhammad ibn al-Hassan Shammun has said that Ahmad ibn Muhammad narrated to me the following. “I wrote to abu Muhammad عليه السلام when al-Muhtadi had began to kill the Turkish Mawali (slave or supporters). My master, we thank Allah for diverting his (al-Muhtadi’s) attention from us. I have heard that he had threatened you and has said, By Allah, I will wipe them out from the face of the earth.” Abu Muhammad عليه السلام sent in response with his own signature. “This will be much shortening to his life. Count five days from today. On the sixth day he will be killed with humiliation and insults that he will go through.” It then happned exactly as he had said.”