Śatapatha Brāhmaṇa ("of a hundred paths") 4.6.3.2

4.6.3.2

atho apyaindrāgnamevāharahaḥ paśumālabheta | agnirvai sarvā devatā agnau hi sarvābhyo devatābhyo juhvatīndro vai yajñasya devatā tatsarvāścaivaitaddevatā nāparādhnoti yo ca yajñasya devatā tāṃ nāparādhnoti

Or one may day after day seize a victim for Indra and Agni; for all the gods are Agni, since in Agni offering is made to all the deities; and Indra is the deity of the sacrifice: thus he neither offends any of the deities, nor does he offend him who is the deity of the sacrifice.