RV 4.21.8
वि यद् वरांसि पर्वतस्य वृण्वे पयोभिर् जिन्वे अपां जवांसि । विदद् गौरस्य गवयस्य गोहे यदी वाजाय सुध्यो वहन्ति ॥
vi yad varāṃsi parvatasya vṛṇve payobhir jinve apāṃ javāṃsi | vidad gaurasya gavayasya gohe yadī vājāya sudhyo vahanti ||
Devanagari rendered by HREEM from the edition's roman (IAST) text; the IAST is the edition's own.
When he unbars the spaces of the mountains, and quickens with his floods the water-torrents, He finds in lair the buffalo and wild-ox when the wise lead him on to vigorous exploit.
Translated by Ralph T. H. Griffith (1896)