Śatapatha Brāhmaṇa ("of a hundred paths") 2.4.1.13

2.4.1.13

sa āhavanīyamevāgra upatiṣṭhate | atha gārhapatyaṃ tūṣṇīmevāhavanīyamupatiṣṭhate tūṣṇīmupaviśya tṛṇānyapalumpati tūṣṇīmeva gārhapatyamupatiṣṭhate tūṣṇīmupaviśya tṛṇānyapalumpati

He first approaches the Âhavanîya, and thereupon the Gârhapatya. Silently he approaches the Âhavanîya; and silently he sits down and sweeps away the grass-blades. Silently he approaches the Gârhapatya; and silently he sits down and sweeps away the grass-blades.