Śatapatha Brāhmaṇa ("of a hundred paths") 7.2.4.22

7.2.4.22

dvādaśabhirṛgbhiḥ kṛṣṭe vapati | dvādaśa māsāḥ saṃvatsaraḥ saṃvatsaro 'gniryāvānagniryāvatyasya mātrā tāvataivainametadbhiṣajyati

With twelve verses he sows on the ploughed ground,--twelve months are a year, and the year is Agni: as great as Agni is, as great as is his measure, with so much he thus heals him.