Shiva Purana
सात्त्विकं दैवतानां हि यतीनामूर्द्ध्वरेतसाम् ॥ राजसं दानवानां हि मनुष्याणां तथैव च ॥ तामसं राक्षसानां हि नराणां क्रूरकर्मणाम् ॥ १०॥
The Sāttvika penance is performed by the gods and the ascetics of sublimated prowess; the Rājasa penance is by the Dānavas and human beings.
english translation
sAttvikaM daivatAnAM hi yatInAmUrddhvaretasAm ॥ rAjasaM dAnavAnAM hi manuSyANAM tathaiva ca ॥ tAmasaM rAkSasAnAM hi narANAM krUrakarmaNAm ॥ 10॥
hk transliteration by Sanscript