Śatapatha Brāhmaṇa ("of a hundred paths") 2.3.4.23

2.3.4.23

etena ha sma vā ṛṣayaḥ | rātreḥ svasti pāraṃ samaśnuvata eteno ha smainānrātrernāṣṭrā rakṣāṃsi na vindantyeteno evaiṣa etadrātreḥ svasti pāraṃ samaśnuta eteno enaṃ rātrernāṣṭrā rakṣāṃsi na vindantyetāvannu tiṣṭhañjapati

Now it was by means of this same (text) that the Rishis reached safely the end of the night; and because of it the evil spirits, the Rakshas, did not find them: by it, therefore, he also now reaches safely the end of the night; and because of it the evil spirits, the Rakshas, find him not.--This much he mutters while standing.