Kali Santaraṇa Upaniṣad of Krishna Yajur Veda
At the end of Dvapara-Yuga, Narada approached Brahma and addressed him thus: "O Lord, how shall I, roaming over the earth, be able to across Kali?"
To which Brahma thus replied: "Well asked. Hearken to that which all shrutis (the Vedas) keep secret and hidden, through which one may cross the samsara (mundane existence) of Kali. He shakes off (the evil effects of) Kali through the mere uttering of the name of Lord Narayana, who is the primeval Purusha".
Again Narada asked Brahma: "What is the name?"
To which Hiranyagarbha (Brahma) replied thus:
"Hare Krishna Hare Krishna Krishna Krishna Hare Hare
Hare Rama Hare Rama Rama Rama Hare Hare
These sixteen names (words) are destructive of the evil effects of Kali Yuga. No better means than this is to be seen in all the Vedas. These (sixteen names) destroy the avarana (or the centripetal force which produces the sense of individuality) of jiva surrounded by the sixteen kalas (rays). Then like the sphere of the sun which shines fully after the clouds (screening it) disperse, ParaBrahman (alone) shines."
Narada asked: "O Lord, what are the rules to be observed with reference to it?"
To which Brahma replied, "There are no rules for it. Whoever in a pure or an impure state, utters these always, attains the same world of, or proximity with, or the same form of, or absorption into Brahman."
Whoever utters three and a half Crores (or thirty-five millions) times this mantra composed of sixteen names is absolved of the karmic sin of the murder of a brahmana. He becomes purified from the sin of the theft of gold. He becomes purified from the sin of cohabitation with a woman of low caste. He is purified from the sins of wrong done to pitris, devas and men. Having given up all dharmas, he becomes freed at once from all karmic sins. He is at released from all material bondage.
Thus ends the Kalisantarana Upanishad belonging to the Krishna Yajur Veda.
Jai Śrī Kṛṣṇa! Hari Om Tat Sat