Śatapatha Brāhmaṇa ("of a hundred paths") 6.7.4.6

6.7.4.6

yadveva viṣṇukramavātsapre bhavataḥ | viṣṇukramairvai prajāsya mātrā tāvataivainametadupatiṣṭatepatirimaṃ lokamasṛjata vātsapreṇāgniṃ viṣṇukramairvai prajāpatirantarikṣamasṛjata vātsapreṇa vāyaṃ viṣṇukramairvai prajāpatirdivamasṛjata vātsapreṇādityaṃ viṣṇukramairvai prajāpatirdiśo 'sṛjata vātsapreṇa candramasaṃ viṣṇukramairvai prajāpatirbhūtamasṛjata vātsapreṇa bhaviṣyadviṣṇukramairvai prajāpatirvittamasṛjata vātsapreṇāśāṃ viṣṇukramairvai prajāpatiraharasṛjata vātsapreṇa rātriṃ viṣṇukramairvai prajāpatiḥ pūrvapakṣānasṛjata vātsapreṇāparapakṣānviṣṇukramairvai prajāpatirardhamāsānasṛjata vātsapreṇa māsānviṣṇukramairvai prajāpatirṛtūnasṛjata vātsapreṇa saṃvatsaraṃ tadyadviṣṇukramavātsapre bhavata etadeva tena sarvaṃ sṛjate

These (three verses) have one and the same explanation regarding him (Agni): they are Trishtubh verses relating to Agni. Inasmuch as they relate to Agni, they are Agni; and inasmuch as they are Trishtubhs, and eleven (syllables), they are Indra;--but Agni consists of Indra and Agni: as great as Agni is, as great as is his measure, with so much he thus stands worshipping by him. And Indra and Agni are all the gods, and Agni includes (or belongs to) all the deities: as great as Agni is, as great as is his measure, with so much he thus stands worshipping by him.