Śatapatha Brāhmaṇa ("of a hundred paths") 1.1.2.15

1.1.2.15

athāpāsyati | apahataṃ rakṣa iti yadyatra kiñcidāpannam bhavati yadyu nābhyeva mṛśettannāṣṭrā evaitadrakṣāṃ syato 'pahanti

With the text (Vâg. S. I, 9 e), 'Repelled is the Rakshas!' he then throws away whatever (grass, &c.) may have fallen on it. But if nothing (have fallen on it), let him merely touch it. He thereby drives away from it the evil spirits, the Rakshas.