Valmiki Ramayana Yuddha Kanda Sarga 80 Shloka 15

आदित्यकल्पेन effulgent as the orbit of the sun, तेनब्रह्मार्स्तेण by that weapon of Brahma, पालितःruled, सुमहाबलः of mighty prowess, सःरावणिःRavani son of Ravana, दुराधर्षःdifficult to gain over, बभूवappeared

Protected by the weapon of Brahma, effulgent as the orbit of the Sun, the son of Ravana was endowed with mighty prowess and was difficult to gain over.