Musnad Ahmad 1785

It was narrated that al-"Abbas said: I was with the Prophet (ﷺ) one night, and he said: "Look, do you see any stars in the sky?" I said: Yes. He said: "What do you see?" I said: I see the Pleiades. He said: "Some of your offspring, as many as these stars, will take control of the ummah, two of whom will come to power through turmoil."