Śatapatha Brāhmaṇa ("of a hundred paths") 7.4.1.9

7.4.1.9

apām pṛṣṭhamasi yoniragneriti | apāṃ hīyam pṛṣṭhaṃ yonirhīyamagneḥ samudramabhitaḥ pinvamānamiti samudro homāmabhitaḥ pinvate vardhamāno mahāṃ ā ca puṣkara iti vardhamāno mahīyasva puṣkara ityetaddivo mātrayā varimṇā prathasvetyanuvimārṣṭyasau vā āditya eṣo 'gnirno haitamanyo divo varimā yantumarhati dyaurbhūtvainaṃ yacetyevaitadāha svarājopaddhāti svārājyaṃ hyapāṃ sādayitvā sūdadohasādhivadati tasyokto bandhuḥ

[He lays it down, with Vâg. S. XIII, 2] 'The waters’ back thou art, the womb of Agni,' for this earth is indeed the back of the waters, and the womb of Agni;--'around the swelling ocean,' for the ocean indeed swells around this earth;--'growing great on the lotus,' that is, 'growing, flourish thou on the lotus;'--'spread out with the extent, with the breadth, of the sky!' with this he strokes along (the leaf),--for this Agni is yonder sun, and no other extent but that of the sky is able to contain him: he thus says (to the leaf), Having become the sky, contain him! He lays it down with a Svarâg verse, for self-rule (svârâgya) belongs to the waters. Having 'settled' it, he pronounces the Sûdadohas upon it: the significance of this has been explained.