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:589a –
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السيوطي:٥٨٩a –

"أحبُّ الأعمالِ إلى اللهِ - بعد الفرائضِ -: إدخالُ السرورِ على المسلمِ".  

[طب] الطبرانى في الكبير عن ابن عباس

See similar narrations below:

Collected by Ṭabarānī
tabarani:11079 – Muḥammad b. al-Faraḥ al-Aṣbahānī > Ismāʿīl b. ʿAmr al-Bajalī > Sharīk > Layth > Mujāhid > Ibn ʿAbbās

[Machine] The Messenger of Allah ﷺ said, "Verily, the most beloved deeds to Allah after the obligatory acts are bringing happiness to a Muslim."  

الطبراني:١١٠٧٩ – حَدَّثَنَا مُحَمَّدُ بْنُ الْفَرَحِ الْأَصْبَهَانِيُّ ثنا إِسْمَاعِيلُ بْنُ عَمْرٍو الْبَجَلِيُّ ثنا شَرِيكٌ عَنْ لَيْثٍ عَنْ مُجَاهِدٍ عَنِ ابْنِ عَبَّاسٍ ؓ قَالَ

قَالَ رَسُولُ اللهِ ﷺ «إِنَّ أَحَبَّ الْأَعْمَالِ إِلَى اللهِ بَعْدَ الْفَرَائِضِ إِدْخَالُ السُّرُورِ عَلَى الْمُسْلِمِ»