Śatapatha Brāhmaṇa ("of a hundred paths") 10.4.3.24

10.4.3.24

tadāhuḥ kathamasyaitā anatiriktā upahitā bhavantīti vīryaṃ vā asyaitā anatiriktaṃ vai puruṣaṃ vīryaṃ sa ha vā etaṃ sarvaṃ kṛtsnam prajāpatiṃ saṃskaroti ya evaṃ vidvānetatkarma kurute yo vaitadevaṃ veda

As to this they say, 'How are these (bricks) of his laid down so as not to be excessive?' Well, these (bricks) are his (Agni's) vital power, and man's vital power is not excessive. Thus whosoever, knowing this, performs this holy work, or he who but knows this, makes up this Pragâpati whole and complete.