Śatapatha Brāhmaṇa ("of a hundred paths") 2.3.4.22

2.3.4.22

citrāvaso svasti te pāramaśīyeti | triretajjapati rātrirvai citrāvasuḥ sā hīyaṃ saṃgṛhyeva citrāṇi vasati tasmānnārakāccitraṃ dadṛśe

'O thou, rich in lights, may I safely reach thine end!' this he mutters thrice. She that is rich in lights (kitrâvasu) doubtless is the night, since the latter, as it were, rests (vas) after gathering together the lights (kitrâ): hence (at night) one does not see clearly (kitram) from afar.