Śatapatha Brāhmaṇa ("of a hundred paths") 7.3.1.6

7.3.1.6

yadveva vyatiṣajati | ātmā vā agnī raso 'dhvara ātmānaṃ tadrasenānuṣajati tasmādayamāntamevātmā rasenānuṣakto 'thāhavanīyasyārdhamaiti

And, again, why he interlinks them,--Agni is the body, and the (Soma) sacrifice is the vital sap: he thus supplies the body with vital sap, and hence this body is supplied with vital sap from end to end. He then returns to the site of the Âhavanîya.