Bhagavatapurana 3.29.43

3.29.43

nabho dadāti śvasatāṃ padaṃ yan-niyamād adaḥ /
lokaṃ sva-dehaṃ tanute mahān saptabhir āvṛtam //

43. By His command the sky affords room for breathing-creatures and the Mahat Tattva expands its own body into the world enclosed in seven sheaths;