Śatapatha Brāhmaṇa ("of a hundred paths") 7.2.2.13

7.2.2.13

catasraḥ sītā yajuṣā kṛṣati | tadyaccatasṛṣu dikṣvannaṃ tadasminnetaddadhāti tadvai yajuṣāddhā vai tadyadyajuraddho tadyadimā diśaḥ

Four furrows he ploughs with prayer: he thereby puts into him (Pragâpati-Agni) what food there is in the four quarters; and that with prayer,--true is the prayer, and true (manifest) are those quarters.