Hadithcore
Al-Adab Al-Mufrad, 130
hasan· Al-Albani

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."

حَدَّثَنَا الْحُمَيْدِيُّ، قَالَ‏:‏ حَدَّثَنَا سُفْيَانُ، قَالَ‏:‏ حَدَّثَنَا سَالِمُ بْنُ أَبِي حَفْصَةَ، عَنْ مُنْذِرٍ الثَّوْرِيِّ، عَنْ مُحَمَّدِ بْنِ عَلِيِّ بْنِ الْحَنَفِيَّةِ‏:‏ ‏{‏هَلْ جَزَاءُ الإِحْسَانِ إِلاَّ الإِحْسَانُ‏}‏، قَالَ‏:‏ هِيَ مُسَجَّلَةٌ لِلْبَرِّ وَالْفَاجِرِ‏.‏

References2 variants
In-Book Reference
Book 7, Hadith 2
English Reference
Book 7, Hadith 130