Shatapatha Brahmana 4.5.2.12

4.5.2.12

purudasmo viṣurūpa induriti | bahudāna iti haitadyadāha purudasma iti viṣurūpa iti viṣurūpā iva hi garbhā indurantarmahimānamānañja dhīra ityantarhyeṣa mātaryakto bhavatyekapadīṃ dvipadīṃ tripadīṃ catuṣpadīmaṣṭāpadīm bhuvanānu prathantāṃ svāheti prathayatyevaināmetatsubhūyo ha jayatyaṣṭāpadyeṣṭvā yaducānaṣṭāpadyā

With (Vâg. S. VIII, 30), 'The bountiful multiform juice,'--by 'bountiful' he means to say (the bestower) 'of numerous gifts;' and 'the multiform' he says, because embryos are, as it were, multiform,--'The strong juice hath invested itself with greatness:'--for it (the embryo) is indeed invested in the mother.--'May the worlds spread along her, the one-footed, two-footed, three-footed, four-footed, eight-footed,'--'Hail!' He thereby magnifies her (the cow): far more, forsooth, does he gain by offering an eight-footed one, than by one not eight-footed.