Śatapatha Brāhmaṇa ("of a hundred paths") 3.1.4.14

3.1.4.14

sarasvatyai pūṣṇe 'gnaye svāheti | vāgvai sarasvatī vāgyajñaḥ sāsyaiṣātmandevatādhītā bhavati vākpaśavo vai pūṣā puṣṭirvai pūṣā puṣṭiḥ paśavaḥ paśavo hi yajñaste 'syaita ātmanpaśava ādhītā bhavanti tadyadasyaitā ātmandevatā ādhītā bhavanti tasmādādhītayajūṃṣi nāma

'To Sarasvatî, to Pûshan, to Agni, hail!' he says; for Sarasvatî is speech, and the sacrifice also is speech: this deity--Speech--is meditated upon in his mind. Pûshan, on the other hand, means cattle, for Pûshan means prosperity (pushti), and cattle means prosperity, since the sacrifice means cattle: hence cattle-are meditated upon in his mind. And because these deities are meditated upon (â-dhîta) in his mind, therefore (these libations) are called âdhîtayagûmshi.