法苑珠林 6.102

6.102

又僧護經云。爾時世尊告僧護比丘。汝於海中所見龍王。受此龍身。牙甲鱗角。其狀可畏。臭穢難近。以畜生道障出家法。不能得免金翅鳥王之所食噉。龍性多睡。有五法不能隱身。一生時。二死時。三婬時。四瞋時。五睡時。復有四毒不能如法。一以聲毒故不能如法。若出聲者聞則害人。二以見毒故不能如法。若見身者必能害人。三以氣毒故不能如法。若被氣噓必能害人。四以觸毒故不能如法。若觸身者必能害人。

Furthermore, the Saṅgharakṣita Sūtra says: 'At that time, the World-Honoured One told the monk Saṅgharakṣita, "The dragon king you saw in the ocean received this dragon body with teeth, claws, scales, and horns; its appearance is terrifying and its stench foul and difficult to approach. Because the animal realm obstructs the Dharma of going forth, it cannot escape being devoured by the king of garuḍas. Dragons are by nature given to much sleep. There are five states in which they cannot conceal their forms: first, at birth; second, at death; third, during sexual intercourse; fourth, when angry; and fifth, when asleep. Furthermore, they have four kinds of poison that prevent them from acting in accordance with the Dharma: first, by poison of voice they cannot act in accordance with the Dharma, for if they utter a sound, anyone who hears it is harmed; second, by poison of sight they cannot act in accordance with the Dharma, for if anyone sees their body, it is bound to harm them; third, by poison of breath they cannot act in accordance with the Dharma, for if blown upon by their breath, it is bound to harm them; fourth, by poison of touch they cannot act in accordance with the Dharma, for if anyone touches their body, it is bound to harm them."'