Śatapatha Brāhmaṇa ("of a hundred paths") 6.3.3.21

6.3.3.21

dvābhyāmabhijuhoti | dvipādyajamāno yajamāno 'gniryāvānagniryāvatyasya mātrā tāvataivainametatadreto bhūtaṃ siñcatyāgneyībhyāmagnimevaitadreto bhūtaṃ siñcati te yadāgneyyo tenāgniratha yattriṣṭubhau tenendra aindrāgno 'gniryāvānagniryāvatyasya mātrā tāvataivainametadreto bhūtaṃ siñcatīndrāgnī vai sarve devāḥ sarvadevatyo 'gniryāvānagniryāvatyasya mātrā tāvataivainametadreto bhūtaṃ siñcati

With two (verses) he offers; for the Sacrificer is two-footed, and the Sacrificer is Agni: as great as Agni is, as great as is his measure, by so much he thus pours him forth as seed;--with two (verses) relating to Agni: it is Agni he thereby pours forth as seed. Inasmuch as they relate to Agni, they are Agni; and inasmuch as they are Trishtubhs, they are Indra; and Agni (the fire) belongs to Indra and Agni: as great as Agni is, as great as is his measure, by so much he thus pours him forth as seed. Moreover, Indra and Agni are all the gods, and Agni (thus) contains all deities: as great as Agni is, as great as is his measure, by so much he thus pours him forth as seed.