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:16138a –
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السيوطي:١٦١٣٨a –

"قَال اللهُ - ﷻ -: أحبُّ مَا تَعَبَّدَنِى بِهِ عَبْدِي إِلَى النصح لِي".  

ابن المبارك، [حم] أحمد والحكيم، كل عن أبي أُمامة

See similar narrations below:

Collected by Aḥmad, Suyūṭī
ahmad:22191 – ʿAlī b. Isḥāq > ʿAbdullāh b. al-Mubārak > Yaḥyá b. Ayyūb > ʿUbaydullāh b. Zaḥr > ʿAlī b. Yazīd > al-Qāsim > Abū Umāmah

[Machine] The Prophet ﷺ said, "Allah said, 'The most beloved thing with which My servant worships Me is sincerity and loyalty to Me.'"  

أحمد:٢٢١٩١ – حَدَّثَنَا عَلِيُّ بْنُ إِسْحَاقَ أَخْبَرَنَا عَبْدُ اللهِ بْنُ الْمُبَارَكِ أَخْبَرَنَا يَحْيَى بْنُ أَيُّوبَ عَنْ عُبَيْدِ اللهِ بْنِ زَحْرٍ عَنْ عَلِيِّ بْنِ يَزِيدَ عَنِ الْقَاسِمِ عَنْ أَبِي أُمَامَةَ

عَنِ النَّبِيِّ ﷺ قَالَ قَالَ اللهُ أَحَبُّ مَا تَعَبَّدَنِي بِهِ عَبْدِي إِلَيَّ النُّصْحُ لِي