RV 6.9.1
अहश् च कृष्णम् अहर् अर्जुनं च वि वर्तेते रजसी वेद्याभिः । वैश्वानरो जायमानो न राजावातिरज् ज्योतिषाग्निस् तमांसि ॥
ahaś ca kṛṣṇam ahar arjunaṃ ca vi vartete rajasī vedyābhiḥ | vaiśvānaro jāyamāno na rājāvātiraj jyotiṣāgnis tamāṃsi ||
Devanagari rendered by HREEM from the edition's roman (IAST) text; the IAST is the edition's own.
One half of day is dark, and bright the other: both atmospheres move on by sage devices. Agni Vaisvanara, when born as Sovran, hath with his lustre overcome the darkness.
Translated by Ralph T. H. Griffith (1896)