Jaiminīya (Talavakāra) Brāhmaṇa 58.321

58.321

prajāpatirvāvedamagra āsīt
so'kāmayata bahu syāṃ prajāyeya bhūmānaṃ gaccheyamiti
so'ṣṭādaśaivākṣarāṇi prajāyata
tāni dvedhā vyauhannavānyāni navānyāni
sa eva trivṛcca stomo'bhavadgāyatrī ca chandaḥ
so'yaṃ saṃpūrṇastrivṛtstoma āsīd | atha gāyatrī praṇavanavamāsīt
praṇavastasyai navama āsīt
tāmayaṃ trivṛtstomo'bravīdgāyatrīmehi saṃbhavāveti
tau samau santau nāśaknutāṃ saṃbhavaitum
tāmabravīnna vaitarhi śakṣyāvassamau santau saṃbhavitum
yatta etannavamamakṣaraṃ tadudūhasveti
tatkiṃ bhaviṣyati
yadevāsti tadbhaviṣyatīti
tatheti
tadudauhata
sa eva praṇavo'bhavat

Prajāpati alone was here in the beginning.
He desired: 'May I be many, may I propagate, may I reach abundance.'
He generated eighteen syllables.
He divided them into two: nine of one kind, nine of the other.
He became both the Trivṛt stoma and the Gāyatrī meter.
This Trivṛt stoma was complete, while the Gāyatrī was nine-syllabled with the praṇava [oṃ].
The praṇava was its ninth.
This Trivṛt stoma said to that Gāyatrī: 'Come, let us unite.'
Being equal, the two could not unite.
He said to her: 'Indeed, we two will not be able to unite while being equal.
Push out that ninth syllable of yours.'
[She asked:] 'What will it become?'
'Whatever is, that it will become,' [he replied].
'So be it,' [she said].
She pushed it out.
It became the praṇava itself.