Śatapatha Brāhmaṇa ("of a hundred paths") 4.2.1.20

4.2.1.20

so 'dhvaryuḥ | aprokṣitaṃ yūpaśakalaṃ nirasyati nirastaḥ śaṇḍa ityevameva pratiprasthātā nirasto marka iti tatpurāhutibhyo 'surarakṣase apahataḥ

The Adhvaryu throws the unsprinkled stake-chip outside (the altar) with, 'Cast out is Sanda!' and in like manner the Pratiprasthâtri with, 'Cast out is Marka!' Thus they drive away the two Asura-Rakshas before the offerings.