Śatapatha Brāhmaṇa ("of a hundred paths") 4.2.1.14

4.2.1.14

so 'dhvaryuḥ | aprokṣitena yūpaśakalenāpamārṣṭyapamṛṣṭaḥ śaṇḍa ityevameva pratiprasthātāpamṛṣṭau marka iti tadādadānāvevāsurarakṣase apahato devāstvā śukrapāḥ praṇayantvityevādhvaryurniṣkrāmati devāstvā manthipāḥ praṇayantviti pratiprasthātā tadetau devatābhya eva praṇayataḥ

The Adhvaryu cleanses (his cup) with the unsprinkled chip, with, Swept away is Sanda!' In like manner the Pratiprasthâtri with, 'Swept away is Marka!' Thus even while drawing (the cups), they drive away the two Asura-Rakshas. With 'May the Sukra-sipping gods lead thee forward!' the Adhvaryu walks out (of the cart-shed); with 'May the Manthin-sipping gods lead thee forward!' the Pratiprasthâtri: thus they lead forward those two (libations) to the deities.