शुक्लयजुर्वेदसंहिता

The passage says this in so many words.

• Śukla Yajurveda · Adhyāyas 17.33 Cited by The third adhyaya of the Rudrashtadhyayi calls on Indra himself

  The opening verse of the Apratiratha hymn praises Indra as the sole hero who conquers a hundred armies at once.

  The speaker paraphrases it as a plea to Indra to destroy one's enemies; this verse praises his conquest, and the call to strike enemies comes in the verses that follow.