RV 7.25.1
आ ते मह इन्द्रोत्य् उग्र समन्यवो यत् समरन्त सेनाः । पताति दिद्युन् नर्यस्य बाह्वोर् मा ते मनो विष्वद्र्यग् वि चारीत् ॥
ā te maha indroty ugra samanyavo yat samaranta senāḥ | patāti didyun naryasya bāhvor mā te mano viṣvadryag vi cārīt ||
Devanagari rendered by HREEM from the edition's roman (IAST) text; the IAST is the edition's own.
When with thy mighty help, O potent Indra, the armies rush together in their fury. When from the strong man's arm the lightning flieth, let not the mind go forth to side with others.
Translated by Ralph T. H. Griffith (1896)