RV 10.147.1
श्रत् ते दधामि प्रथमाय मन्यवे ऽहन् यद् वृत्रं नर्यं विवेर् अपः । उभे यत् त्वा भवतो रोदसी अनु रेजते शुष्मात् पृथिवी चिद् अद्रिवः ॥
śrat te dadhāmi prathamāya manyave 'han yad vṛtraṃ naryaṃ viver apaḥ | ubhe yat tvā bhavato rodasī anu rejate śuṣmāt pṛthivī cid adrivaḥ ||
Devanagari rendered by HREEM from the edition's roman (IAST) text; the IAST is the edition's own.
I TRUST in thy first wrathful deed, O Indra, when thou slewest Vrtra and didst work to profit man; What time the two world-halves fell short of thee in might, and the earth trembled at thy force, O Thunder-anned.
Translated by Ralph T. H. Griffith (1896)