Śatapatha Brāhmaṇa ("of a hundred paths") 2.2.2.3

2.2.2.3

tā vai ṣaḍdadyāt | ṣaḍvā ṛtavaḥ saṃvatsarasya saṃvatsaro yajñaḥ prajāpatiḥ sa yāvāneva yajño yāvatyasya mātrā tāvatībhirdakṣayati

He may give six (cows); for six seasons, indeed, there are in the year, and the sacrifice, Pragâpati, is the year: thus as great as the sacrifice is, as large as its extent is, by so many (gifts, dakshinâs) does he thereby invigorate it.