Shiva Purana
दुष्टानामपि सत्त्वानां तथान्येषान्दुरात्मनाम् ॥ स एव द्रावको भूत्वा विचचार तपोवने ॥ १७ ॥
He roamed about the penance-grove as a router of wicked animals and wicked souls.
english translation
duSTAnAmapi sattvAnAM tathAnyeSAndurAtmanAm ॥ sa eva drAvako bhUtvA vicacAra tapovane ॥ 17 ॥
hk transliteration by Sanscript