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:10218a –
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السيوطي:١٠٢١٨a –

"الإِيمان يزيد وينقص".  

[حم] أحمد [د] أبو داود من حديث معاذ بن جبل

See similar narrations below:

Collected by Ibn Mājah, Suyūṭī
ibnmajah:75 – Abū ʿUthmān al-Bukhārī > al-Haytham > Ismāʿīl > Jarīr b. ʿUthmān > al-Ḥārith Aẓunnuh > Mujāhid > Abū al-Dardāʾ

"Faith increases and decreases."  

ابن ماجة:٧٥ – حَدَّثَنَا أَبُو عُثْمَانَ الْبُخَارِيُّ حَدَّثَنَا الْهَيْثَمُ حَدَّثَنَا إِسْمَاعِيلُ عَنْ جَرِيرِ بْنِ عُثْمَانَ عَنِ الْحَارِثِ أَظُنُّهُ عَنْ مُجَاهِدٍ عَنْ أَبِي الدَّرْدَاءِ قَالَ

الإِيمَانُ يَزْدَادُ وَيَنْقُصُ