Shiva Purana
यदा दग्धो रावणेनावगुंठ्य वसनानि च ॥ तैलाभ्यक्तानि सुदृढं महाबलवता मुने॥ २३॥
When he was burnt by Ravana he wrapped up his clothes O sage they were firmly rubbed with oil by the mighty.
english translation
yadA dagdho rAvaNenAvaguMThya vasanAni ca ॥ tailAbhyaktAni sudRDhaM mahAbalavatA mune॥ 23॥
hk transliteration by Sanscript