Śatapatha Brāhmaṇa ("of a hundred paths") 11.5.4.15

11.5.4.15

tāṃ vai paco'nvāha trayo vai prāṇāḥ prāṇa udāno vyānastānevāsmiṃstaddadhātyathārdharcaśo dvau vā imau prāṇau prāṇodānāveva prāṇodānāvevāsmiṃstaddadhātyatha kṛtsnāmeko vā ayam prāṇaḥ kṛtsna eva prāṇamevāsmiṃstatkṛtsnaṃ dadhāti

He (first) recites it by pâdas: there being three breathings, the out-breathing, the up-breathing and the through-breathing; it is these he thus lays into him;--then by half-verses: there being these two (principal) breathings, the out-breathing and the up-breathing, it is the out-breathing and the up-breathing he thus lays into him;--then the whole (verse): there being this one vital air (in man), he thus lays the whole vital air into the whole of him.