Śatapatha Brāhmaṇa ("of a hundred paths") 1.7.1.4

1.7.1.4

atha mātṛṇāmekāṃ śākhayopaspṛśati | vatsena vyākṛtya devo vaḥ savitā prārpayatviti savitā vai devānām prasavitā savitṛprasūtā yajñaṃ sambharāniti tasmādāha devo vaḥ savitā prārpayatviti

After separating one of the mothers from her calf, he touches her, with the text (Vâg. S. I, I d), 'May the divine Savitri animate you--' for Savitri, indeed, is the impeller (prasavitri) of the gods: 'may they, impelled by Savitri, prepare the sacrifice!' so he thinks, and for this reason he says, 'May the divine Savitri animate you!'