Hiranyakeshigrihyasutra 2.3.8.2

2.3.8.2

āpūryamāṇapakṣe puṇye nakṣatregnimupasamādhāya saṃparistīrya payasi sthālīpākaṃ śrapayitvābhighāryodvāsyāpareṇāgniṃ dve kuṭī kṛtvā dakṣiṇasyāṃ śūlagavamāvāhayati \ ā tvā vahantu harayaḥ sacetasaḥ śvetairaśvaiḥ saha ketumadbhiḥ \ vātājirairbalavadbhirmanojavairāyāhi śīdhraṃ mama havyāya śarvom \ iti \2\

In the fortnight of the increasing moon, under an auspicious constellation, he puts wood on the fire, strews (Darbha grass) on the entire surface around the fire, cooks a mess of sacrificial food with milk, sprinkles it (with Âgya), takes it from the fire, builds two huts to the west of the fire, and has the spit-ox led to the southerly (hut) with (the verse), 'May the fallow steeds, the harmonious ones, bring thee hither, together with the white horses, the bright, wind-swift, strong ones, that are as quick as thought. Come quickly to my offering, Sarva! Om!'