Śatapatha Brāhmaṇa ("of a hundred paths") 10.4.2.31

10.4.2.31

tasyaiṣā pratiṣṭhā ya eṣa tapatyetasmādvevādhicīyata etasminnadhicīyata ātmana evainaṃ tannirmimīta ātmanaḥ prajanayati sa yadaivaṃvidasmāllokātpraityathaitamevātmānamabhisambhavati candomayam prāṇamayaṃ devatāmayaṃ sa etanmaya eva bhūtvordhva utkrāmati ya evaṃ vidvānetatkarma kurute yo vaitadevaṃ veda

And he who shines yonder is his foundation, for over him he is built up, on him he is built up: from out of his own self he thus fashions him, from out of his own self he generates him. And when he who knows this departs from this world, then he passes into that body composed of the metres, stomas, vital airs, and deities; and verily having become composed of all that, he who, knowing this performs this sacrificial work, or he who even knows it, ascends upwards.