Shatapatha Brahmana 5.1.1.15

5.1.1.15

tadyathaivādo bṛhaspatiḥ | savitāram prasavāyopādhāvatsavitā vai devānām prasavitedam me prasuva tvatprasūta idamujjayānīti tadasmai savitā prasavitā prāsuvattatsavitṛprasūta udajayadevamevaiṣa etatsavitārameva prasavāyopadhāvati savitā vai devānām prasavitedam me prasuva tvatprasūta idamujjayānīti tadasmai savitā prasavitā prasauti tatsavitṛprasūta ujjayati

And even as then Brihaspati hasted up to Savitri for his impulsion Savitri being the impeller among the gods--saying, 'Impel this for me, (so that) impelled by thee I may win it!' and Savitri, as the impeller, impelled it for him; and impelled by Savitri he won it; even so does this (sacrificing king) now haste up to Savitri for his impulsion--Savitri being the impeller among the gods--saying, 'Impel this for me: may I win it, impelled by thee!' and Savitri, as the impeller, impels it for him, and he wins it impelled by Savitri.