Śatapatha Brāhmaṇa ("of a hundred paths") 5.4.3.15

5.4.3.15

sa juhoti | agnaye gṛhapataye svāheti sa yadevāgneyaṃ rathasya tadevaitena prīṇāti vahā vā āgneyā rathasya vahānevaitena prīṇāti śrīrvai gārhapataṃ yāvato-yāvata īṣṭe tacriyamevāsyaitadgārhapataṃ rājyamabhivimucyate

He offers with (Vâg. S. X, 23), 'To Agni, the House-lord, hail!' He thereby pleases the part of the chariot relating to Agni; and it is the shoulder-pieces of the chariot that relate to Agni it is the shoulder-pieces (of the yoke) he thereby pleases. And the house-lord's position means prosperity: as much as he (the king) rules over, for the prosperity, the house-lordship, of that his kingship is thereby rendered free (unopposed).