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:11662a –
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السيوطي:١١٦٦٢a –

"الَّذِينَ لا تَزَالُ أَلْسِنُتهُم رَطبَةً مِنْ ذِكْرِ اللهِ: يَدْخُلُ أَحَدُهُمْ الجَنَّةَ وَهُوَ يَضْحَكُ".  

ابن شاهين في الترغيب في الذكر عن أبي ذر، أبو الشيخ في الثواب عن أبي الدرداء، [ش] ابن أبى شيبة عنه موقوفًا

See similar narrations below:

Collected by Aḥmad's Zuhd
ahmad-zuhd:726 – ʿAbdullāh from my father > ʿAbd al-Raḥman > Muʿāwiyah b. Ṣāliḥ > ʿAbd al-Raḥman b. Jubayr b. Nufayr from his father > Abū al-Dardāʾ ؒ

[Machine] Indeed, those whose tongues are moist with the remembrance of Allah, they shall enter Paradise while they are laughing.  

الزهد لأحمد:٧٢٦ – حَدَّثَنَا عَبْدُ اللَّهِ حَدَّثَنِي أَبِي حَدَّثَنَا عَبْدُ الرَّحْمَنِ حَدَّثَنَا مُعَاوِيَةُ بْنُ صَالِحٍ عَنْ عَبْدِ الرَّحْمَنِ بْنِ جُبَيْرِ بْنِ نُفَيْرٍ عَنْ أَبِيهِ عَنْ أَبِي الدَّرْدَاءِ رَحِمَهُ اللَّهُ قَالَ

إِنَّ الَّذِينَ أَلْسِنَتُهُمْ رَطْبَةٌ بِذِكْرِ اللَّهِ يَدْخُلُ الْجَنَّةَ وَهُوَ يَضْحَكُ