Shatapatha Brahmana 9.5.2.10

9.5.2.10

aindrāgnībhirupatiṣṭhate | aindrāgno 'gniryāvānagniryāvatyasya mātrā tāvatraivāsya tadāpnoti yadasya kiṃ cānāptamindrāgnī vai sarve devāḥ sarvadevatyo 'gniryāvānagniryāvatyasya mātrā tāvataivāsya tadāpnoti yadasya kiṃ cānāptam

With (verses) addressed to Indra and Agni he approaches (the fire);--the fire-altar belongs to Indra and Agni: as great as Agni is, as great as is his measure, by so much he thus gains for him whatever has not been gained for him. And Indra and Agni are all the gods, and the fire-altar belongs to (or Agni is) all the deities: as great as Agni is, as great as is his measure, by so much he thus gains for him whatever has not been gained for him.