淨名經集解關中疏 1.401

1.401

"'and Nigaṇṭha Nātaputta—are your teachers;" Sengzhao says: Nigaṇṭha was the general name for their renunciants, just as renunciation in the Buddha's dharma is called śramaṇa. Nāta was his mother's name. This person asserted that offenses, blessings, suffering, and pleasure originally have fixed causes and must definitely be experienced, and cannot be severed by practicing the path. Before the Buddha appeared in the world, these six teachers were all masters of the path in India.