Shiva Purana
फलाभिलाषरहितैश्चिन्त्याश्चिन्ताविशारदैः ॥ घोराश्चेच्चिंतिताः कुर्युः पापरोगपरिक्षयम् ॥ ७६ ॥
Without desire for fruits they are experts in anxiety and anxiety If they are terrible they should be worried about and should be tested for sinful diseases.
english translation
phalAbhilASarahitaizcintyAzcintAvizAradaiH ॥ ghorAzcecciMtitAH kuryuH pAparogaparikSayam ॥ 76 ॥
hk transliteration by Sanscript