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:13306a –
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السيوطي:١٣٣٠٦a –

"جَدِّدُوا إِيمانَكُمْ -قيل: يا رسولَ اللَّه كيفَ نُجَدِّدُ إِيمانَنَا؟ قال-: أَكْثِرُوا مِنْ قولِ لا إِله إِلا اللَّه".  

[حم] أحمد والحكيم، [ك] الحاكم في المستدرك عن أَبى هريرة

See similar narrations below:

Collected by Aḥmad
ahmad:8710 –

[Machine] The Messenger of Allah ﷺ said, "Renew your faith." It was asked, "O Messenger of Allah, how do we renew our faith?" He replied, "Increase your saying of 'There is no god but Allah'."  

أحمد:٨٧١٠ –

وَقَالَ رَسُولُ اللهِ ﷺ جَدِّدُوا إِيمَانَكُمْ قِيلَ يَا رَسُولَ اللهِ وَكَيْفَ نُجَدِّدُ إِيمَانَنَا؟ قَالَ أَكْثِرُوا مِنْ قَوْلِ لَا إِلَهَ إِلَّا اللهُ