Śatapatha Brāhmaṇa ("of a hundred paths") 10.4.5.3

10.4.5.3

celaka u ha smāha śāṇḍilyāyanaḥ ima eva lokāstisraḥ svayamātṛṇavatyaścitayo yajamānaścaturthī sarve kāmāḥ pañcamīmāṃśca lokāntsaṃskurva ātmānaṃ ca sarvāṃśca kāmānityeva vidyāditi

And Kelaka Sândilyâyana said, 'Let him know that the three layers containing the naturally-perforated (bricks) are these worlds, that the fourth (layer) is the Sacrificer, and the fifth all objects of desire; and that it is these worlds, and his own self and all his objects of desire he compasses.'