Śatapatha Brāhmaṇa ("of a hundred paths") 7.2.4.17

7.2.4.17

sa vai kṛṣṭe vapati | tasmātkṛṣṭe 'nnam pacyate yatkṛṣṭa eva vapennākṛṣṭe kṛṣṭa evānnam pacyeta nākṛṣṭe 'tha yadakṛṣṭa eva vapenna kṛṣṭe 'kṛṣṭa evānnam pacyeta na kṛṣṭe kṛṣṭe cākṛṣṭe ca vapati tasmātkṛṣṭe cākṛṣṭe cānnam pacyate

On the ploughed ground he sows, whence food ripens on ploughed ground. Were he to sow only on the ploughed ground, and not on the unploughed, food would only ripen on ploughed ground, not on unploughed; and were he to sow only on unploughed ground, and not on ploughed ground, food would only ripen on unploughed ground, and not on ploughed ground. He sows on both the ploughed, and the unploughed, ground: hence food ripens both on ploughed, and on unploughed, ground.