Skandapurana 7.18.89_146

7.18.89_146

sakṛdeva samāhārādasakṛtparimokṣaṇāt .
kumbhakaṃ caitaduddiṣṭaṃ18 prāṇāyāmādidhāraṇāt . . 3 9. .
prāṇo vāyurasāvātmā śarīre jīva - - - .
vidyād rūpadvayaṃ tasya sthūlaṃ sūkṣmaṃ ca sarvataḥ ..8.174.40..

From drawing in [the breath] just once, and from releasing it repeatedly, / this is designated as kumbhaka, from the holding of prāṇāyāma and the rest.
This vital breath (prāṇa) is the wind, the self in the body, the living […] / One should know its two forms: coarse and subtle everywhere.