Shiva Purana
कर्तारस्तपसां भूयो द्विजतेजोपहारकाः । शिश्वल्पमृत्युकाराश्च मंत्रोच्चारपरायणाः २६ ।
In their eagerness to appropriate a brahmanical splendour they frequently perform penances. They cause infantile and premature deaths by their chanting of mantras.
english translation
kartArastapasAM bhUyo dvijatejopahArakAH । zizvalpamRtyukArAzca maMtroccAraparAyaNAH 26 ।
hk transliteration by Sanscript