Śatapatha Brāhmaṇa ("of a hundred paths") 3.5.3.10

3.5.3.10

atha punaḥ prapadya | caturgṛhītamājyaṃ gṛhītvā sāvitram prasavāya juhoti savitā vai devānām prasavitā savitṛprasūtāya yajñaṃ tanavāmahā iti tasmātsāvitraṃ juhoti

Now, having again entered (the hall), and taken ghee in four ladlings, he makes offering to Savitri for his impulsion, for Savitri is the impeller (prasavitri) of the gods: 'We will perform the sacrifice, for one impelled by Savitri,' thus (the priest thinks and) therefore he makes offering to Savitri.