Śatapatha Brāhmaṇa ("of a hundred paths") 5.2.2.14

5.2.2.14

tadu haika āhuḥ | viśveṣāṃ tvā devānāṃ yanturyantriye dadhāmīti sarvaṃ vai viśve devāstadenaṃ sarvasyaiva yanturyantriye dadhāti tadu tathā na brūyātsarasvatyai tvā vāco yanturyantriye dadhāmītyeva brūyādvāgvai sarasvatī tadenaṃ vāca eva yanturyantriye dadhāti bṛhaspateṣṭvā sāmrājyenābhiṣiñcāmyasāviti nāma gṛhṇāti tadbṛhaspaterevainametatsāyujyaṃ salokatāṃ gamayati

Here now some say, 'I place thee in the leading of the leader of all the gods;' for all the gods are the All: he thus places him in the leading of the leader of the All. But let him not say so; let him rather say, 'I place thee in the leading of Sarasvatî Vâk;' for Sarasvatî is Vâk: he thus places him in the leading of Vâk.--'I consecrate thee, N.N., with the supreme rulership of Brihaspati!' therewith he mentions the (Sacrificer's) name: he thus makes him attain to the fellowship of Brihaspati, and to co-existence in his world.