Shatapatha Brahmana 8.1.1.5

8.1.1.5

tasya prāṇo bhauvāyana iti | prāṇaṃ tasmādrūpādagnerniramimīta vasantaḥ prāṇāyana iti vasantamṛtum prāṇānniramimīta gāyatrī vāsantīti gāyatrīṃ cando vasantādṛtorniramimīta gāyatryai gāyatramiti gāyatryai candaso gāyatraṃ sāma niramimīta gāyatrādupāṃśuriti gāyatrātsāmna upāṃśuṃ grahaṃ niramimītopāṃśostrivṛdityupāṃśorgrahāttrivṛtaṃ stomaṃ niramimīta trivṛto rathantaramiti trivṛta stomādrathantaram pṛṣṭhaṃ niramimīta

[The others with], 'His, the Existent's son, the Breath,'--from out of that form, fire, he (Pragâpati) fashioned the breath;--'Spring, the son of the breath,'--from out of the breath he fashioned the spring-season;--'The Gâyatrî, the daughter of the Spring,'--from out of the spring-season he fashioned the Gâyatrî metre;--'From the Gâyatrî the Gâyatra,'--from out of the Gâyatrî metre he fashioned the Gâyatra hymn-tune;--'From the Gâyatra the Upâmsu,'--from out of the Gâyatra hymn-tune he fashioned the Upâmsu-graha;-- 'From the Upâmsu the Trivrit,'--from out of the Upâmsu-graha he fashioned the nine-versed hymn-form;--'From the Trivrit the Rathantara,'--from out of the Trivrit-stoma he fashioned the Rathantara-prishtha.