Śatapatha Brāhmaṇa ("of a hundred paths") 4.4.1.3

4.4.1.3

eṣa vai savitā ya eṣa tapati | eṣa u eva sarva ṛtavastadṛtavaḥ saṃvatsarastṛtīyasavane pratyakṣamavakalpyante tasmātsāvitraṃ gṛhṇāti

But Savitri, forsooth, is he that burns yonder (the sun); and he indeed is all the seasons: thus the seasons, the year, are overtly attended to at the evening feast,--for this reason he draws the Sâvitra cup.