佛說仁王般若波羅蜜經 2.43

2.43

"Great King! I now clearly see with the five eyes that all kings of the three times, because they served five hundred buddhas in the past, have attained being sovereigns and rulers of kings. For this reason, all sages and arhats are born in their states to bring about great benefit. When a king's merit is exhausted, all sages will abandon him and depart. When all sages depart, the seven calamities will surely arise.