RV 10.81.4
किं स्विद् वनं क उ स वृक्ष आस यतो द्यावापृथिवी निष्टतक्षुः । मनीषिणो मनसा पृच्छतेद् उ तद् यद् अध्यतिष्ठद् भुवनानि धारयन् ॥
kiṃ svid vanaṃ ka u sa vṛkṣa āsa yato dyāvāpṛthivī niṣṭatakṣuḥ | manīṣiṇo manasā pṛcchated u tad yad adhyatiṣṭhad bhuvanāni dhārayan ||
Devanagari rendered by HREEM from the edition's roman (IAST) text; the IAST is the edition's own.
What was the tree, what wood in sooth produced it, from which they fashioned out the earth and heaven? Ye thoughtful men inquire within your spirit whereon he stood when he established all things.
Translated by Ralph T. H. Griffith (1896)