Śatapatha Brāhmaṇa ("of a hundred paths") 4.5.4.6

4.5.4.6

tānvai prātaḥsavane gṛhṇīyāt | āgrayaṇaṃ gṛhītvātmā vā āgrayaṇo bahu vā idamātmana ekaikamatiriktaṃ klomahṛdayaṃ tvadyattvat

Let him draw them at the morning pressing, after drawing the Âgrayana; for the Âgrayana is the self (body), and many parts of this self are one each (and thus) over and above (the others), such as the lung and heart, and others.