Śatapatha Brāhmaṇa ("of a hundred paths") 14.2.2.1

14.2.2.1

sa yatraitāṃ hotānvāha praitu brahmaṇaspatiḥ pra devyetu sūnṛteti tadadhvaryuḥ prāṅudāyanvātanāmāni juhotyetadvai devā abibhayuryadvai na imamantarā rakṣāṃsi nāṣṭrā na hanyuriti tametatpuraivāhavanīyātsvāhākāreṇājuhavustaṃ hutameva santamagnāva juhuvustatho evainameṣa etatpuraivāhavanīyātsvāhākāreṇa juhoti taṃ hutameva santamagnau juhoti

And when the Hotri recites this (verse), 'Let Brahmanaspati go forward, let the goddess Sûnritâ go forward,'--the Adhvaryu, stepping forward, makes offering (by muttering) the wind-names. For at this time the gods were afraid lest the Rakshas, the fiends, might injure that (Pravargya) of theirs in the middle (of the sacrifice): they offered it with the Svâhâ-call before (its being taken to) the Âhavanîya, being thus offered they offered it (again) in the fire; and in like manner does this one now offer it with the Svâhâ-call before (its being taken to) the Âhavanîya, and being thus offered he offers it (again) in the fire.