RV 10.113.7
या वीर्याणि प्रथमानि कर्त्वा महित्वेभिर् यतमानौ समीयतुः । ध्वान्तं तमो ऽव दध्वसे हत इन्द्रो मह्ना पूर्वहूताव् अपत्यत ॥
yā vīryāṇi prathamāni kartvā mahitvebhir yatamānau samīyatuḥ | dhvāntaṃ tamo 'va dadhvase hata indro mahnā pūrvahūtāv apatyata ||
Devanagari rendered by HREEM from the edition's roman (IAST) text; the IAST is the edition's own.
Even in the first of those heroic acts which they who strove together came with might to execute, Deep darkness fell upon the slain, and Indra won by victory the right of being first invoked.
Translated by Ralph T. H. Griffith (1896)