Śatapatha Brāhmaṇa ("of a hundred paths") 6.4.2.8

6.4.2.8

athaiṣā bṛhatyuttamā bhavati | bṛhatīṃ vā eṣa saṃcito 'bhisampadyate yādṛgvai yonau retaḥ sicyate tādṛgjāyate tadyadetāmatra bṛhatīṃ karoti tasmādeṣa saṃcito bṛhatīmabhisampadyate

Then there is this last Brihatî verse, for this (fire-altar) when completely built up becomes like the Brihatî (the great) metre: whatlike seed is infused into the womb, suchlike is (the child) born; and because he now makes this verse a Brihatî, therefore this (altar) when completely built up becomes like the Brihatî.