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:17386a –
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السيوطي:١٧٣٨٦a –

"لَقَدْ اسْتَجَنَّ بِجُنَّةٍ حَصِينَةٍ مِنْ النَّارِ مَن سَلَفَ له ثَلاثةُ أَوْلادٍ فِي الإِسْلام".  

[ع] أبو يعلى [طب] الطبرانى في الكبير عن عثمان بن أبي العاص

See similar narrations below:

Collected by Ṭabarānī
tabarani:8345 – ʿAlī b. ʿAbd al-ʿAzīz > ʿUmar b. Ḥafṣ b. Ghiyāth from my father > ʿAbd al-Raḥman b. Isḥāq > Yazīd b. al-Ḥakam > ʿUthmān b. Abū al-ʿĀṣ

[Machine] The Messenger of Allah, ﷺ , said: "Indeed, a man has successfully protected himself from the Fire with a strong fortress in Paradise by fulfilling three things in Islam."  

الطبراني:٨٣٤٥ – حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ الْعَزِيزِ ثنا عُمَرُ بْنُ حَفْصِ بْنِ غِيَاثٍ ثنا أَبِي عَنْ عَبْدِ الرَّحْمَنِ بْنِ إِسْحَاقَ عَنْ يَزِيدَ بْنِ الْحَكَمِ عَنْ عُثْمَانَ بْنِ أَبِي الْعَاصِ قَالَ

قَالَ رَسُولُ اللهِ ﷺ لَقَدِ اسْتَجَنَّ بِجُنَّةٍ حَصِينَةٍ مِنَ النَّارِ رَجُلٌ سَلَفَ بَيْنَ يَدَيْهِ ثَلَاثَةٌ مِنْ صُلْبِهِ فِي الْإِسْلَامِ