Kali Sàntaran Upànishad

The smallest Upànishad Kali Sàntaran Upànishad from the Krişna Yàjur Véda expounds about glorious mantrà:

हरे राम हरे राम राम राम हरे हरे।
हरे कृष्ण हरे कृष्ण कृष्ण कृष्ण हरे हरे॥

Srī Nārada appeared in Bràhma Loka and asked Pitāmah Bràhma
at the end of Dvāpara, "O
Lord, how shall I, roaming over the earth be able to overcome the effects of Kali Yuga?"

Pītāmah Brahma replied thus, " You have asked well. Listen to that which all the Vedas keep secret and hidden, through which one may cross the ocean of mundane
existence (samsara) during Kali Yuga.

It is through the mere recitation of the names of the Primeval Personality of Srīman NARAYANA, that one transcends the evil effects of the Kali Yuga.

These sixteen names destroy the negative effects of Kali. No better means (upaya) than this is to be had in all the Vedas.

These sixteen names destroy the 16 envelopments in which the jiva is enveloped (avarana).
Then like the Sun which shines forth once the clouds are dispersed,
Parabrahman alone radiates forth."

Again Srī Narada asked, "O Pītamah what are the regulations (vidhi) to be observed?"

To which Brahma ji replied, "There are no regulations. Whoever in a pure or impure state chants these names always, attains the same world (salokya), proximity to (samipya), the same form as (sarupya) or absorption into Brahman (sayujya).

Whoever chants this mantra
of sixteen names 35 million times is absolved of the sin of murdering a Brahmin and that of murdering a hero. He is absolved of the sin of the theft of gold. He becomes
purified from sexual misconduct.

Having abandoned all Dharmas, he is absolved from all sins. He becomes immediately liberated. This is the Upanishad.

।।श्री जानकीवल्ल्भो विजयते।।