Śatapatha Brāhmaṇa ("of a hundred paths") 7.2.4.29

7.2.4.29

athāto niruktāniruktānāmeva | yajuṣā dvāvanaḍvāhau yunakti tūṣṇīmitarānyajuṣā catasraḥ kṛṣati tūṣṇīmitarā stūṣṇīṃ darbhastambamupadadhāti yajuṣābhijuhoti tūṣṇīmudacamasānninayati yajuṣā vapati

Now, then, regarding the defined and the undefined (ceremonies);--with prayer he yokes two oxen, silently the others; with prayer he ploughs four furrows, silently the others; silently he puts on the grass-bush, with prayer he makes a libation thereon; silently he pours out the jarfuls of water, with prayer he sows.