Śatapatha Brāhmaṇa ("of a hundred paths") 10.2.3.18

10.2.3.18

saptavidho vā agre prajāpatirasṛjyata sa ātmānaṃ vidadhāna aitsa ekaśatavidhe'tiṣṭhata sa yo'rvācīnaṃ saptavidhādvidhatta etaṃ ha sa pitaram prajāpatiṃ vicinatti sa iṣṭvā pāpīyānbhavati yathā śreyāṃsaṃ hiṃsitvātha sa ekaśatavidhamatividhatte'smātsa sarvasmādbahirdhā niṣpadyate sarvamu hīdam prajāpatistasmādu saptavidhameva prathamaṃ vidadhītāthaikottaramaikaśatavidhādekaśatavidhaṃ tu nātividadhīta nāhaitam pitaram prajāpatiṃ vicinatti no asmātsarvasmādbahirdhā niṣpadyate

Sevenfold, indeed, Pragâpati was created in the beginning. He went on constructing (developing) his body, and stopped at the one hundred and one-fold one. He who constructs one lower than a sevenfold one cuts this Father Pragâpati in twain: he will be the worse for sacrificing as one would be by doing injury to his better. And he who constructs one exceeding the one hundred and one-fold one steps beyond this universe, for Pragâpati is this universe. Hence he should first construct the sevenfold (altar), then the next higher up to the one hundred and one-fold one, but he should not construct one exceeding the one hundred and one-fold one, and thus, indeed, he neither cuts this Father Pragâpati in twain, nor does he step beyond this universe.