Śatapatha Brāhmaṇa ("of a hundred paths") 7.1.2.22

7.1.2.22

saiṣā bṛhatyeva | ye vai dve dvātriṃśatau dvātriṃśadeva tadathaite dve yajuṣī taccatustriṃśadagnireva pañcatriṃśo nākṣarāccando vyetyekasmānna dvābhyāṃ sa u dvyakṣarastatṣaṭtriṃśatṣaṭtriṃśadakṣarā bṛhatī bṛhatīṃ vā eṣa saṃcito 'bhisampadyate yādṛgvai yonau retaḥ sicyate tādṛgjāyate tadyadetāmatra bṛhatīṃ karoti tasmādeṣa saṃcito bṛhatīmabhisampadyate

Then that Brihatî (metre),--the two (verses) of thirty-two syllables: that makes thirty-two; then those two formulas: that makes thirty-four; Agni the thirty-fifth;--a metre does not vanish by a syllable (too much or too little), neither by one nor by two;--moreover, that (Agni) consists of two syllables: that makes thirty-six. The Brihatî consists of thirty-six syllables,--it is the Brihatî that that (Âhavanîya) pile thus amounts to; for whatlike the seed which is infused into the womb, suchlike (offspring) is born therefrom: thus in that he makes up that Brihatî (metre) in this (Gârhapatya hearth), thereby that (Âhavanîya) fire-altar amounts to the Brihatî.