RV 3.31.21
अदेदिष्ट वृत्रहा गोपतिर् गा अन्तः कृष्णां अरुषैर् धामभिर् गात् । प्र सूनृता दिशमान ऋतेन दुरश् च विश्वा अवृणोद् अप स्वाः ॥
adediṣṭa vṛtrahā gopatir gā antaḥ kṛṣṇāṃ aruṣair dhāmabhir gāt | pra sūnṛtā diśamāna ṛtena duraś ca viśvā avṛṇod apa svāḥ ||
Devanagari rendered by HREEM from the edition's roman (IAST) text; the IAST is the edition's own.
His kine their Lord hath shown, e'en Vrtra's slayer, through the black hosts he passed with red attendants. Teaching us pleasant things by holy Order, to, us hath he thrown open all his portals.
Translated by Ralph T. H. Griffith (1896)