Vishnupurana 2.15.4

2.15.4

tasya śiṣyo nidāgho 'bhūt pulastyatanayaḥ purā
prādād aśeṣavijñānaṃ sa tasmai parayā mudā //

PARÁŚARA continued.--Having terminated these remarks, the Brahman repeated to the silent and meditating prince a tale illustrative of the doctrines of unity. "Listen, prince," he proceeded, "to what was formerly uttered by Ribhu, imparting holy knowledge to the Brahman Nidágha. Ribhu was a son of the supreme Brahmá, who, from his innate disposition, was of a holy character, and acquainted with true wisdom. Nidágha, the son of Pulastya, was his disciple; and to him Ribhu communicated willingly perfect knowledge, not doubting of his being fully confirmed in the doctrines of unity, when he had been thus instructed.