Bhagavatapurana 3.10.9

3.10.9

etāvāñ jīva-lokasya saṃsthā-bhedaḥ samāhṛtaḥ /
dharmasya hy animittasya vipākaḥ parameṣṭhy asau //

9. The arrangement of the world occupied by living beings is briefly of this extent; and the region of Brahma is a place where righteous duties performed without desire bear fruit. (Note:—that region is not subject to changes as the three worlds occupied by ordinary beings.)