Shatapatha Brahmana 11.1.6.30

11.1.6.30

ayamevāvāṅ prāṇaḥ sviṣṭakṛt sa yattamabhyardha ivetarābhya āhutibhyo juhoti tasmādetasmātprāṇātsarve prāṇā bībhatsante'tha yatsviṣṭakṛte sarveṣāṃ haviṣāmavadyati tasmādyatkiṃ cemānprāṇānāpadyata etameva tatsarvaṃ samavaiti

The Svishtakrit is the same as this downward breathing; and because he offers that (oblation), as it were, apart from the other oblations, therefore all the breathings recoil from that breathing; and because for the Svishtakrit he cuts portions from all the sacrificial dishes, therefore everything that enters these (channels of the other) breathings meets in (the channel of) that breathing.