佛說佛名經 3.23

3.23

馬頭羅剎答曰：「此諸沙門罪人，受佛淨戒不護威儀，捨正法服便着俗衣不如法衣，違佛淨禁惡因緣故墮此地獄。」

The horse-headed rākṣasa answered, saying: 'These sinner śramaṇas received the pure precepts of the Buddha but did not protect the dignified deportment; they discarded the proper robes of the Dharma and wore lay clothing, robes not in accordance with the Dharma. Because of these evil causes and conditions of violating the Buddha's pure prohibitions, they have fallen into this hell.'