Musannaf Ibn Abi Shayba 37:137

Abu Usama narrated to us, from Abdullah bin Muhammad bin Amr bin Ali, who said: My father narrated to me, saying: Ali said: "By the One who split the grain and created the soul, the removal of mountains from their places is easier than the removal of a kingdom that has an appointed term. So when they differ among themselves, then by the One in whose hand is my soul, if the hyenas were to plot against them, they would overcome them."