کتاب الفتن · نُعیم بن حماد

The last sign of the demise of the rule of the Banu Abbas are three kings among them who succeed one another. Their names are the names of the prophets. They will not exceed them after these kings. The duration of the Banu Abbas among these three kings is forty years. If you see differences among them, and a group of Banu Hashim gathered between the two rivers, and the mandate of a man from the Banu Abbas towards the west, and the clashing of the black flags, and zeroing in the navel of the Levant, and the killing of the governor of Egypt, and the prevention of its tax, then it is a sign of the interruption of their period.

The Sufyani who dies, fighting the first of the black flags and the yellow flags in the navel of the Levant, emerging from the mandarin east of Baysan, on a red camel, wearing a crown, defeats the group twice, then perishes while accepting the tribute, taking the offspring captive, and tearing open the stomachs of the pregnant ones.