Śatapatha Brāhmaṇa ("of a hundred paths") 8.2.1.15

8.2.1.15

kulāyinī ghṛtavatī puraṃdhiriti | kulāyamiva vā asyaitadātmanaḥ svairdakṣairdakṣapiteha sīdetyadakṣayatāmevāsyaitadātmanaḥ pṛthivyāḥ purīṣamasīti purīṣasaṃhitamiva vā asyaitadātmano retaḥsicorvelayā pṛṣṭayo vai retaḥsicau pṛṣṭisācayamiva vā asyaitadātmanaḥ sarvata upadadhāti sarvato hyasyaitadaśvināvātmanaḥ pratyadhattām

'Nestlike, fat, wise,' he says, for this indeed is as a nest for his body.--'By thine own powers seat thee here, a holder of powers,' he says, for they did make that (part) of him powerful.--'Thou art the Earth's soil-cover,' he says, for that (lower part) of his body is, as it were, in connection with the soil-cover. At the range of the Retahsik (he places the bricks),--the Retahsik are the ribs, for level with the ribs, as it were, is that (part) of his body. He places them on every side, for on every side the Asvins restored that (part) of his (Pragâpati's) body.