Śatapatha Brāhmaṇa ("of a hundred paths") 1.3.4.13

1.3.4.13

atha dakṣiṇena juhūm pratigṛhṇāti | nediha purā nāṣṭrārakṣāṃsyāviśāniti brāhmaṇo hi rakṣasāmapahantā tasmādabhinihita eva savyena pāṇinā bhavati

He seizes the guhû with his right, fearing 'lest the evil spirits, the Rakshas, should enter there in the meantime;' for the officiating priest (brâhmana) is the repeller of the Rakshas: therefore, while it (the prastara) is still being held down with his left hand,--