Paraskaragrihyasutra 3.2.7

3.2.7

dakṣiṇato brahmāṇamupaveśyottarata udapātraṃ śamīśākhāsītāloṣṭhāśmano nidhāyāgnimīkṣamāṇo japati \ ayamagnirvīratamo 'yaṃ bhagavattamaḥ sahasrasātamaḥ \ suvīryo 'yaṃ śraiṣṭhye dadhātu nāviti \7\

Having caused the Brahman to sit down southward, and having placed to the north a water-pot, a Samî branch, an earth-clod taken out of a furrow, and a stone, he murmurs, looking at the fire: 'This Agni is most valiant, he is most blessed, the best giver of a thousand boons, highly powerful. May he establish us both in the highest place.'