Śatapatha Brāhmaṇa ("of a hundred paths") 3.7.1.11

3.7.1.11

so 'nakti | devastvā savitā madhvānaktviti savitā vai devānām prasavitā yajamāno vā eṣa nidānena yadyūpaḥ sarvaṃ vā idam madhu yadidaṃ kiṃ ca tadenamanena sarveṇa saṃsparśayati tadasmai savitā prasavitā prasauti tasmādāha devastvā savitā madhvānaktviti

He anoints it with, 'The divine Savitri anoint thee with sweet drink (milk)!' for Savitri is the impeller (prasavitri) of the gods, and that stake is in reality the sacrificer himself; and sweet drink is everything here; he thus puts it in connection with all that, and Savitri, the impeller, impels it for him: therefore he says, 'The divine Savitri anoint thee with sweet drink!'