Paraskaragrihyasutra 2.14.11

2.14.11

prāśanānte saktūnāmekadeśaṃ śūrpe nyupyopaniṣkramya bahiḥ śālāyāḥ sthaṇḍilamupalipyolkāyāṃ dhriyamāṇāyāṃ mā 'ntarāgamatetyuktvā vāgyataḥ sarpānavanejayati \11\

After he has eaten (of the sacrificial food), he throws a portion of the flour into a basket, goes out, besmears an elevated spot outside the hall (with cowdung), says, while a fire-brand is held (before him), 'Do not step between (myself and the fire),' and without speaking (anything except the Mantras), he causes the serpents to wash themselves, (pouring out water for them, with the formulas:)