(72) بَابُ الإِحْسَانِ إِلَى الْبَرِّ وَالْفَاجِرِ
Mundhir at-Tawri reported what Muhammad ibn 'Ali (ibn al-Hanafiyya)said about, "Is the repayment of kindness anything except kindness?" He said,"It is not denied to either the pious or the deviant."
Reference: Al-Adab Al-Mufrad 130
In-book reference: Book 7, Hadith 2
English translation: Book 7, Hadith 130