Shiva Purana
अपकारिषु यो लोक उपकारं करोति वै ॥ तेन पूतो भवाम्यत्र भगवद्वचनं त्विदम् ॥ १३ ॥
The lord has said, “I become sanctified by the person who in this world helps those who harm him."
english translation
apakAriSu yo loka upakAraM karoti vai ॥ tena pUto bhavAmyatra bhagavadvacanaM tvidam ॥ 13 ॥
hk transliteration by Sanscript