Śatapatha Brāhmaṇa ("of a hundred paths") 4.6.4.3

4.6.4.3

evaṃ vā ete bhavanti | ye saṃvatsaramāsate yathaiva tatprajāpatiḥ prajāḥ sasṛjāna āsītsa yathaiva tatprajāpatiḥ saṃvatsare 'nnādyamabhyudatiṣṭhadevamevaita etatsaṃvatsare 'nnādyamabhyuttiṣṭhanti yeṣāmevaṃ viduṣāmetaṃ grahaṃ gṛhṇanti

Now, even as Pragâpati then was, when he had created the living beings, so are those who sit (in sacrificial session) for a year; and as Pragâpati then, after a year, approached food, so do they now, after a year, approach food, for whomsoever that knows this, they draw that cup.