Shiva Purana
देवादय ऊचुः ॥ रावणोयं दुरात्मा हि देवद्रोही खलः कुधीः ॥ शिवाद्वरं च संप्राप्य दुःखं दास्यति नोऽपि सः ॥ २९ ॥
The gods and sages said:— “Rāvaṇa is a wicked knave. He is evil-minded and hater of the gods. After securing the boon from Śiva, he will make us more miserable.
english translation
devAdaya UcuH ॥ rAvaNoyaM durAtmA hi devadrohI khalaH kudhIH ॥ zivAdvaraM ca saMprApya duHkhaM dAsyati no'pi saH ॥ 29 ॥
hk transliteration by Sanscript