The Vishnu Purana
Chapters
The Vishnu Purana: Book II: Chapter VIII

[paragraph continues] Rishis, the offerers of oblations with fire, reverencing the Vedas, after whose injunctions creation commenced, and who were discharging the duties of ministrant priests: for as the worlds are destroyed and renewed, they institute new rules of conduct, and reestablish the interrupted ritual of the Vedas. Mutually descending from each other, progenitor springing from descendant, and descendant from progenitor, in the alternating succession of births, they repeatedly appear in different housed and races along with their posterity, devout practices and instituted observances, residing to the south of the solar orb, as long as the moon and stars endure 22.

The path of the gods lies to the north of the solar sphere, north of the Nágavithi 23, and south of the seven Rishis. There dwell the Siddhas, of subdued senses, continent and pure, undesirous of progeny, and therefore victorious over death: eighty-eight thousand of these chaste beings tenant the regions of the sky, north of the sun, until the destruction of the universe: they enjoy immortality, for that they are holy; exempt from covetousness and concupiscence, love and hatred; taking no part in the procreation of living beings, and detecting the unreality of the properties of elementary matter. By immortality is meant existence to the end of the Kalpa: life as long as the three regions (earth, sky, and heaven) last is called exemption from (reiterated) death 24. The consequences of acts of iniquity or piety, such as Brahmanicide or an Aśwamedha, endure for a similar period, or until the end of a Kalpa 25, when all within the interval between Dhruva and the earth is destroyed.