RV 10.8.8
स पित्र्याण्य् आयुधानि विद्वान् इन्द्रेषित आप्त्यो अभ्य् अयुध्यत् । त्रिशीर्षाणं सप्तरश्मिं जघन्वान् त्वाष्ट्रस्य चिन् निः ससृजे त्रितो गाः ॥
sa pitryāṇy āyudhāni vidvān indreṣita āptyo abhy ayudhyat | triśīrṣāṇaṃ saptaraśmiṃ jaghanvān tvāṣṭrasya cin niḥ sasṛje trito gāḥ ||
Devanagari rendered by HREEM from the edition's roman (IAST) text; the IAST is the edition's own.
Well-skilled to use the weapons of his Father, Aptya, urged on by Indra, fought the battle. Then Trita slew the foe seven-rayed, three-headed, and freed the cattle of the Son of Tvastar.
Translated by Ralph T. H. Griffith (1896)