Matsya Purana 188.71

188.71

akṣayaścāvyayo loke vicarasvākutobhayaḥ.
tato nivārayāmāsa rudraḥ saptaśikhaṃ tadā .. 188.71 ..

"Son! Be not afraid Get into the golden Pura and carry your family and relations with you Vânâsura! you will not be killed by the Devas from now till the time of your doom" The Lord thus again granted such a boon to that demon, and told him to roam about in the world fearlessly and also quenched the raging fire—69 71