Śatapatha Brāhmaṇa ("of a hundred paths") 8.1.2.2

8.1.2.2

tasya cakṣurvaiśvavyacasamiti | cakṣustasmādrūpādādityānniramimīta varṣāścākṣuṣya iti varṣā ṛtuṃ cakṣuṣo niramimīta jagatī vārṣīti jagatīṃ cando varṣābhya ṛtorniramimīta jagatyā ṛkṣamamiti jagatyai candasa ṛkṣamaṃ sāma niramimīta 'rkṣamācukra ityṛkṣamātsāmnaḥ śukraṃ grahaṃ niramimīta śukrātsaptadaśa iti śukrādgrahātsaptadaśaṃ stomaṃ niramimīta saptadaśādvairūpamiti saptadaśātstomādvairūpam pṛṣṭhaṃ niramimīta

'His, the all-embracer's child, the Eye,'--from out of that (all-embracing) form, the Sun, he fashioned the eye;--'the rains, the offspring of the eye,'--from out of the eye he fashioned the rainy season;--'the Gagatî, the daughter of the rains,'--from out of the rainy season he fashioned the Gagatî metre;--'from the Gagatî the Riksama,'--from out of the Gagatî metre he fashioned the Riksama hymn-tune;--'from the Riksama the Sukra,'--from out of the Riksama-sâman he fashioned the Sukra-graha;--'from the Sukra the Saptadasa,'--from out of the Sukra cup he fashioned the seventeen-versed hymn-form;--'from the Saptadasa the Vairûpa,'--from out of the Saptadasa-stoma he fashioned the Vairûpa-prishtha.