法苑珠林 35.65

35.65

又超日明三昧經云。日天王與無數天人。來詣佛所稽首言。以何等行得為日天照四天下。復以何緣而為月天照除夜冥。佛言。有四事。一常喜布施。二修身慎行。三奉戒不犯。四然燈於佛寺。若於父母沙門道人皆殖光明。又身口意行不殺等十善。佛言。又有四事得為月王。一布施貧匱。二奉持五戒。三恭事三尊。四冥設燈光於君父師等。

Furthermore, the Sūryaprabhāsamādhi-sūtra says: The Sun Deva-king, together with countless devas and humans, came to the Buddha's place, bowed his head, and said: 'By what kind of practice does one become the Sun Deva to illuminate the four continents? And by what cause does one become the Moon Deva to illuminate and dispel the night's darkness?' The Buddha said: 'There are four matters: first, always delighting in giving (dāna); second, cultivating oneself and acting cautiously; third, upholding the precepts without violating them; fourth, lighting lamps in Buddhist monasteries, or planting radiance for parents, śramaṇas, and practitioners of the Path. Furthermore, in body, speech, and mind, practicing the ten virtues such as not killing.' The Buddha said: 'There are also four matters by which one becomes the Moon King: first, giving to the poor and destitute; second, upholding the five precepts; third, reverently serving the Three Jewels; fourth, setting up lamp-light in the dark for rulers, fathers, teachers, and others.'