Vishnupurana 2.8.95

2.8.95

ābhūtasaṃplavaṃ sthānamamṛtatvaṃ vibhāvyate /
trailokyasthitikāloyamapunarmāra ucyate //

The path of the gods lies to the north of the solar sphere, north of the Nágavithi, 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. 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, when all within the interval between Dhruva and the earth is destroyed.