Śatapatha Brāhmaṇa ("of a hundred paths") 1.4.1.39

1.4.1.39

devānyakṣi svadhvareti | adhvaro vai yajño devānyakṣi suyajñiyetyevaitadāha tvāṃ hi havyavāḍasītyeṣa hi havyavāḍyadagnistasmādāha tvaṃ hi havyavāḍasītyā juhotā duvasyatāgnim prayatyadhvare vṛṇīdhvaṃ havyavāhanamiti sampreṣyatyevaitayājuhuta ca yajata ca yasmai kāmāya samaindhiḍhvaṃ tatkurutetyevaitadāhāgnim prayatyadhvara ityadhvaro vai yajño 'gnim prayati yajña ityevaitadāha vṛṇīdhvaṃ havyavāhanamityeṣa hi havyavāhano yadagnistasmādāha vṛṇīdhvaṃ havyavāhanamiti

[He continues]: 'Adore, good worshipper, the gods!' worship (adhvara) doubtless means sacrifice: 'adore the gods, good sacrificer,' he thereby says;--'Oblation-bearer, sure, art thou!' for he, Agni, is indeed the bearer of oblations: for this reason he says 'oblation-bearer, sure, art thou.'
[He recites the last sâmidhenî]: 'Make offerings! do reverence! Him, Agni, while the cult proceeds, for your oblation-bearer choose!' by this (verse) he urges them on: 'make offerings and worship! do this for (the accomplishment) of whatever desire you kindled him!' this is what he thereby means to say. 'Him, Agni, while the cult proceeds,' he says, because cult means sacrifice: hence he thereby says, 'him, Agni, whilst the sacrifice proceeds;'--'for your oblation-bearer choose!' for he, Agni, is indeed the oblation-bearer, and for this reason he says 'for your oblation-bearer choose (him)!'