Shatapatha Brahmana 6.2.1.20

6.2.1.20

tadāhuḥ | kathamasyaiṣo 'gniḥ pañceṣṭakaḥ sarvaḥ paśuṣvārabdhā bhavatīti puroḍāśakapāleṣu nvevāpyata iyam prathamā mṛnmayīṣṭakātha yatpaśumālabhate tena paśviṣṭakāpyate 'tha yadvapāmabhito hiraṇyaśakalau bhavatastena hiraṇyeṣṭakāpyate 'tha yadidhmo yūpaḥ paridhayastena vānaspatyeṣṭakāpyate 'tha yadājyam prokṣaṇyaḥ puroḍāśastenānnam pañcamīṣṭakāpyata evamu hāsyaiṣo 'gniḥ pañceṣṭakaḥ sarvaḥ paśuśvārabdho bhavati

Here now they say, 'How is that complete five-bricked fire of his gained in the animals?'--Well, in the kapâlas of the sacrificial cakes that first brick, the earthen one, is obtained; and when he slaughters the animal, thereby the animal brick is obtained, and when two gold chips are (placed) on both sides of the omentum, thereby the gold brick is obtained; and what firewood, stake, and enclosing sticks there are, thereby the wooden brick is obtained; and what ghee, sprinkling-water, and cake there are, thereby the fifth brick, the food, is obtained: thus then that complete five-bricked fire of his is gained in the animals.