Śatapatha Brāhmaṇa ("of a hundred paths") 8.3.3.12

8.3.3.12

taṃ yatra devāḥ samaskurvan | tadasminnetāni sarvāṇi bhūtāni madhyato 'dadhustathaivāsminnayametaddadhāti tā anantarhitā ṛtavyābhya upadadhātyṛtuṣu tatsarvāṇi bhūtāni pratiṣṭhāpayati

And when the gods restored him (Pragâpati-Agni), they put all those living beings inside him, and in like manner does this one now put them therein. He lays them down so as not to be separated from the seasonal (bricks): he thus establishes all living beings in the seasons.