Shatapatha Brahmana 1.9.1.10

1.9.1.10

atha yathādevataṃ | devā ājyapā ājyamajuṣantāvīvṛdhanta maho jyāyo 'krateti tatprayājānuyājānāha prayājānuyājā vai devā ājyapā agnirhotreṇedaṃ havirajuṣatāvīvṛdhata maho jyāyo 'kṛteti tadagniṃ hotreṇāhājuṣatetyevaṃ yā iṣṭā devatā bhavanti tāḥ sampaśyatyasau havirajuṣatāsau havirajuṣateti tadyajñasyaivaitatsamṛddhimāśāste yaddhi devā havirjuṣante tena hi mahajjayati tasmādāhājuṣatetyavīvṛdhateti yadvai devā havirjoṣayante tadapi girimātraṃ kurvate tasmādāhāvīvṛdhateti

And in the same way according to the respective deities. 'The butter-drinking gods have graciously accepted the butter, they have grown in strength, they have acquired greater power;' thereby he refers to the fore-offerings and after-offerings; for the butter-drinking gods truly are the fore-offerings and after-offerings.--'Agni, by virtue of his Hotri-ship, has graciously accepted this oblation, he has grown in strength, the has acquired greater power;' thereby he refers to Agni, in virtue of his Hotriship. With 'has graciously accepted' the thus enumerates those deities to whom offering has been made: in saying 'Such a one has graciously accepted the oblation, such a one has graciously accepted the oblation,' he accordingly prays for the accomplishment of the sacrifice; for whatever oblation the gods graciously accept, by that he gains great things: hence he says, '(he) has graciously accepted it.' And '(he) has grown in strength' he says, because what the gods delight in, they make mountain high: for this reason he says '(he) has increased.'