Musannaf Ibn Abi Shayba 37:310

Abdullah ibn Numayr narrated to us, from Ubaydullah ibn Umar, from Ka’b, who said: A fire is about to emerge from Yemen. It will drive the people; it will go out with them when they go out in the morning, and it will rest with them when they rest at midday, and it will go with them when they go in the evening. So when you hear of that, then go out to Ash-Sham.