Great Dvaipayana composed a holy Upanishad on these facts; and it has been published to the world by the learned and sacred bards in the Puranas.
अनोपनिषदं पुण्यां कृष्णद्वैपायनोऽब्रवीत्। विद्वद्भिः कथ्यते लोके पुराणे कविसत्तमैः॥