Mbh 13.16.1a

"'"Upamanyu said, 'There was in the Krita age, O sire, a Rishi celebrated under the name of Tandi. With great devotion of heart he adored, with the aid of Yoga-meditation, the great God for ten thousand years. Listen to me as I tell the fruit or reward he reaped of such extraordinary devotion. He succeeded in beholding Mahadeva and praised him by uttering some hymns. Thinking, with the aid of his penances, of Him who is the supreme Soul and who is immutable and undeteriorating, Tandi became filled with wonder, and said these words,--"I seek the protection of Him whom the Sankhyas describe and the Yogins think of as the Supreme, the Foremost, the Purusha, the pervader of all things, and the Master of all existent objects, of him who, the learned say, is the cause of both the creation and the destruction of the universe; of him who is superior to all the celestials, the Asuras, and the Munis, of him who has nothing higher, who is unborn, who is the Lord of all things, who has neither beginning nor end, and who is endued with supreme puissance, who is possessed of the highest felicity, and who is effulgent and sinless."