RV 6.21.4
यस् ता चकार स कुह स्विद् इन्द्रः कम् आ जनं चरति कासु विक्षु । कस् ते यज्ञो मनसे शं वराय को अर्क इन्द्र कतमः स होता ॥
yas tā cakāra sa kuha svid indraḥ kam ā janaṃ carati kāsu vikṣu | kas te yajño manase śaṃ varāya ko arka indra katamaḥ sa hotā ||
Devanagari rendered by HREEM from the edition's roman (IAST) text; the IAST is the edition's own.
And he who did these things, where is that Indra? among what tribes? what people doth he visit? What sacrifice contents thy mind , and wishes? What priest among them all? what hymn, O Indra?
Translated by Ralph T. H. Griffith (1896)