Śatapatha Brāhmaṇa ("of a hundred paths") 3.6.3.14

3.6.3.14

prokṣaṇīradhvaryurādatte | sa idhmamevāgre prokṣatyatha vedimathāsmai barhiḥ prayacanti tatpurastādgranthyāsādayati tatprokṣyopaninīya visraṃsya granthimāśvavālaḥ prastara upasaṃnaddho bhavati taṃ gṛhṇāti gṛhītvā prastaramekavṛdbarhi stṛṇāti stīrtvā barhiḥ kārṣmaryamayānparidhīnparidadhāti paridhāya paridhīntsamidhāvabhyādadhātyabhyādhāya samidhau

The Adhvaryu takes the sprinkling-water, and sprinkles first the fire-wood, and then the altar. They then hand to him the altar-grass. He puts it down with the knot towards the east, and sprinkles it. Having poured (the remaining sprinkling-water) upon (the root ends of the altar-grass), and untied the knot,--the Prastara-hunch of asvavâla grass is tied together (with the altar-grass),--he takes that; and having taken the Prastara, he spreads the altar-grass in a single layer. Having spread the altar-grass, he lays the enclosing-sticks of kârshmarya-wood round (the fire). Having laid the enclosing-sticks around, he puts two kindling-sticks (on the fire); and having put on the two kindling-sticks,