佛說仁王般若波羅蜜經 2.38

2.38

佛告波斯匿王：「我當滅度後，法欲滅時，受持是般若波羅蜜，大作佛事。一切國土安立，萬姓快樂，皆由此般若波羅蜜。是故付囑諸國王，不付囑比丘、比丘尼、清信男、清信女。何以故？無王力故，故不付囑。汝當受持讀誦，解其義理。

The Buddha told King Prasenajit: “After my parinirvāṇa, when the Dharma is about to be extinguished, those who uphold this prajñāpāramitā will perform great buddha-work. That all realms are stably established and the myriad common folk enjoy happiness is entirely due to this prajñāpāramitā. For this reason, I entrust it to kings, not to monks, nuns, laymen, or laywomen. Why is this? Because they lack royal power, I do not entrust it to them. You must receive, hold, read, and recite it, and comprehend its meaning and principles.