The Yog Vasishtha narrates the fascinating story of an immortal crow named Bhushunda who is met by Brahmarishi Vasisth. In the course of their conversation the rishi asks him how he has managed to stay unaffected by the various pralays and stuff:
Chapter 21 Verse 14 Vasishta replied, “But tell me, O sagely bird who has borne the blasts of dissolution, how could you remain unhurt and unimpaired when many suns, moons and stars have fallen and faded away?”
15 Bhushunda said:— The order of the world and the laws of nature are broken and dissolved at the end of a kalpa period. Then I am compelled to forsake our nest as an ungrateful man alienates his best friend.
16 Then I remain in the air freed from my fancies, the members of the body become defunct of their natural functions, and the mind is released from its acts of willing.
17 When the zodiacal suns shine in their full vigor and melt down the mountains by their intense heat, I remain with my understanding under the influence of the power of the Varuna mantra.
18 When the doomsday flood winds blow with full force, shattering and scattering huge mountains everywhere, then by remembering the Parvati mantra I remain as fixed as a rock.
19 When the earth with its mountains is dissolved in water and presents the face of a universal ocean over its surface, then by virtue of the flying power of the Vayu mantra I keep myself aloft in the air.
20 Then I convey myself across this visible world and rest in the holy state of the spotless spirit. I remain in a state of profound sleep without any agitation of body or mind.
21 I remain in this mentally tranquil state until the lotus-born Brahma is again employed in his work of creation. Then I reenter into the limits of the re-created world, where I again settle on this tree of desire.
I want to know which are these mantras mentioned by the immortal bird?