Śatapatha Brāhmaṇa ("of a hundred paths") 11.2.7.32

11.2.7.32

saṃvatsaro yajamānaḥ tamṛtavo yājayanti vasanta āgnīdhrastasmādvasante dāvāścaranti taddhyagnirūpaṃ grīṣmo'dhvaryustapta iva vai grīṣmastaptamivādhvaryurniṣkrāmati varṣā udgātā tasmādyadā balavadvarṣati sāmna ivopabdiḥ kriyate śaradbrahmā tasmādyadā sasyam pacyate brahmaṇvatyaḥ prajā ityāhurhemanto hotā tasmāddhemanvaṣaṭkṛtāḥ paśavaḥ sīdantyetā ha vā enaṃ devatā yājayanti sa yadyenamaiṣāvīrā yājayeyuretā eva devatā manasā dhyāyedetā haivainaṃ devatā yājayanti

The Sacrificer is the Year; and the Seasons officiate for him. The Âgnîdhra is the Spring, whence forest-fires take place in spring, for that is a form of Agni. The Adhvaryu is the Summer, for summer is, as it were, scorched; and the Adhvaryu comes forth (from the sacrificial ground) like something scorched. The Udgâtri is the Rainy season; whence, when it rains hard, a sound as that of a chant is produced. 'The Brahman is the Autumn; whence, when the corn ripens, they say, 'The creatures are rich in growth (brahmanvat).' The Hotri is the Winter, whence in winter cattle waste away, having the Vashat uttered over them. These, then, are the divinities that officiate for him; and even if Aishâvîrâh were to officiate for him, let him think in his mind of those divinities, and those deities, indeed, officiate for him.