RV 2.12.1
यो जात एव प्रथमो मनस्वान् देवो देवान् क्रतुना पर्यभूषत् । यस्य शुष्माद् रोदसी अभ्यसेतां नृम्णस्य मह्ना स जनास इन्द्रः ॥
yo jāta eva prathamo manasvān devo devān kratunā paryabhūṣat | yasya śuṣmād rodasī abhyasetāṃ nṛmṇasya mahnā sa janāsa indraḥ ||
Devanagari rendered by HREEM from the edition's roman (IAST) text; the IAST is the edition's own.
He who, just born, chief God of lofty spirit by power and might became the Gods' protector, Before whose breath through greatness of his valour the two worlds trembled, He, O men, is Indra.
Translated by Ralph T. H. Griffith (1896)