RV 7.3.3
उद् यस्य ते नवजातस्य वृष्णो ऽग्ने चरन्त्य् अजरा इधानाः । अच्छा द्याम् अरुषो धूम एति सं दूतो अग्न ईयसे हि देवान् ॥
ud yasya te navajātasya vṛṣṇo 'gne caranty ajarā idhānāḥ | acchā dyām aruṣo dhūma eti saṃ dūto agna īyase hi devān ||
Devanagari rendered by HREEM from the edition's roman (IAST) text; the IAST is the edition's own.
From thee a Bull but newly born, O Agni, the kindled everlasting flames rise upward. Aloft to heaven thy ruddy smoke ascendeth: Agni, thou speedest to the Gods as envoy.
Translated by Ralph T. H. Griffith (1896)