Śatapatha Brāhmaṇa ("of a hundred paths") 4.3.3.12

4.3.3.12

ṛtupātrābhyāṃ gṛhṇāti | ṛtavo vai saṃvatsaro yajñaste 'daḥ prātaḥsavane pratyakṣamavakalpyante yadṛtugrahāngṛhṇātyathaitatparo 'kṣam mādhyandine savane 'vakalpayante yadṛtupātrābhyām marutvatīyāngṛhṇāti viśo vai maruto 'nnaṃ vai viśa ṛtavo vā idaṃ sarvamannādyam pacanti tasmādṛtupātrābhyām marutvatīyāngṛhṇāti

He draws them with the two vessels of the seasons, for the year, the sacrifice, means the seasons. There, at the morning Soma feast, they are overtly attended to, in that he draws the grahas for the seasons; and now they are covertly attended to, in that he draws the Marutvatîya grahas with the two vessels of the seasons.