Śatapatha Brāhmaṇa ("of a hundred paths") 9.4.4.1

9.4.4.1

atha prātaḥ prātaranuvākamupākariṣyan | agniṃ yunakti yuktena samaśnavā iti tena yuktena sarvānkāmāntsamaśnute taṃ vai purastātsarvasya karmaṇo yunakti tadyatkiṃ cātra ūrdhvaṃ kriyate yukte tatsarvaṃ samādhīyate

Then, early next morning, when about to bespeak the morning prayer, he yokes the Fire-altar, thinking, 'With it, when yoked, I shall obtain;' and by it, when yoked, he obtains all wishes. He yokes it prior to the whole performance, so that all that is done thereafter is laden on that yoked (altar-cart).