Devibhagavatapurana 8.13.24

Devībhāgavatapurāṇa 8.13.24

dānavratānuvratau ca caturvarṇā udīritāḥ |
bhagavantaṃ prāṇavāyuṃ prāṇāyāmena saṃyutāḥ ||