菩薩戒本疏 1.55

1.55

若佛子！自說出家、在家菩薩、比丘、比丘尼罪過，教人說罪過，罪過因、罪過緣、罪過法、罪過業。而菩薩聞外道惡人及二乘惡人說佛法中非法、非律，常生悲心，教化是惡人輩，令生大乘善信。而菩薩反更自說佛法中罪過者，是菩薩波羅夷罪。

If a disciple of the Buddha himself speaks of the faults of home-leaving or lay bodhisattvas, bhikṣus, or bhikṣuṇīs, or teaches others to speak of their faults—the causes of faults, the conditions of faults, the methods of faults, the karma of faults—yet a bodhisattva, upon hearing non-Buddhists of evil intent or evil persons of the two vehicles speak of what is contrary to Dharma and contrary to Vinaya within the Buddha's teaching, should always give rise to a mind of compassion and convert these evil persons, causing them to generate wholesome faith in the Mahāyāna; but if the bodhisattva instead speaks himself of faults within the Buddha's teaching, this is a bodhisattva parājika offense.