Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:24009a –
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السيوطي:٢٤٠٠٩a –

"هَلْ جَزَاءُ الإحسانِ إِلا الإحْسانُ؟ هل تَدرونَ ما يقول رَبُّكُمْ؟ هَلْ جزاءُ من أنعمنا عليه بالتوحيدِ إِلا الجنَّةُ".  

أبو نعيم، الديلمي عن أنس

See similar narrations below:

Collected by Suyūṭī
suyuti:4-1401b – ʿAli Fiá Qawlih Hal Jazāʾ al-Iḥsān Illā al-Iḥsān > Qāl Rasūl Allāh ﷺ
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السيوطي:٤-١٤٠١b –

"عَنْ عَلِىٍّ فِى قَوْلِهِ {هَلْ جَزَاءُ الْإِحْسَانِ إِلَّا الْإِحْسَانُ}، قَالَ: قَالَ رَسُولُ الله ﷺ قَالَ الله - ﷻ - هَلْ جَزَاءُ مَنْ أَنْعَمْتُ عَلَيْه بِالتَّوْحِيِد إِلاَّ الْجَنَّةُ؟ ".  

ابن النجار