Musannaf Ibn Abi Shayba 37:511

Wuhayb narrated to us, he said: Abdullah ibn Tawus informed us, from his father, from Abu Musa, that he met him and mentioned the tribulation (fitna). He said: "Indeed, this tribulation is one of the crises of the tribulations, and it is a crushing, all-encompassing one. Whoever rises for it, it will rise for him, and whoever surges for it, it will surge for him."