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
tirmidhi:3590 – al-Ḥusayn b. ʿAlī b. Yazīd al-Ṣudāʾī al-Baghdādī > al-Walīd b. al-Qāsim b. al-Walīd al-Hamdānī > Yazīd b. Kaysān > Abū Ḥāzim > Abū Hurayrah

“No worshipper has ever said: None has the right to be worshipped but Allah (Lā ilāha illallāh)’ sincerely, except that the gates of heaven are opened for it, until it reaches to the Throne, so long as he avoids the major sins.”  

الترمذي:٣٥٩٠ – حَدَّثَنَا الْحُسَيْنُ بْنُ عَلِيِّ بْنِ يَزِيدَ الصُّدَائِيُّ الْبَغْدَادِيُّ حَدَّثَنَا الْوَلِيدُ بْنُ الْقَاسِمِ بْنِ الْوَلِيدِ الْهَمْدَانِيُّ عَنْ يَزِيدَ بْنِ كَيْسَانَ عَنْ أَبِي حَازِمٍ عَنْ أَبِي هُرَيْرَةَ ؓ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ مَا قَالَ عَبْدٌ لاَ إِلَهَ إِلاَّ اللَّهُ قَطُّ مُخْلِصًا إِلاَّ فُتِحَتْ لَهُ أَبْوَابُ السَّمَاءِ حَتَّى تُفْضِيَ إِلَى الْعَرْشِ مَا اجْتَنَبَ الْكَبَائِرَ قَالَ هَذَا حَدِيثٌ حَسَنٌ غَرِيبٌ مِنْ هَذَا الْوَجْهِ  

See similar narrations below:

Collected by Nasāʾī's Kubrá, Suyūṭī
nasai-kubra:10601 – al-Ḥusayn b. ʿAlī b. Yazīd > al-Walīd > Yazīd b. Kaysān > Abū Ḥāzim > Abū Hurayrah

“No worshipper has ever said: None has the right to be worshipped but Allah (Lā ilāha illallāh)’ sincerely, except that the gates of heaven are opened for it, until it reaches to the Throne, so long as he avoids the major sins.” (Using translation from Tirmidhī 3590)   

الكبرى للنسائي:١٠٦٠١ – أَخْبَرَنَا الْحُسَيْنُ بْنُ عَلِيِّ بْنِ يَزِيدَ قَالَ حَدَّثَنَا الْوَلِيدُ عَنْ يَزِيدَ بْنِ كَيْسَانَ عَنْ أَبِي حَازِمٍ عَنْ أَبِي هُرَيْرَةَ قَالَ

قَالَ رَسُولُ اللهِ ﷺ مَا قَالَ عَبْدٌ لَا إِلَهَ إِلَّا اللهُ مُخْلِصًا إِلَّا فُتِحَتْ لَهُ أَبْوَابُ السَّمَاءِ حَتَّى تُفْضِيَ إِلَى الْعَرْشِ مَا اجْتُنِبَتِ الْكَبَائِرُ  

suyuti:19075a –
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السيوطي:١٩٠٧٥a –

"مَا قَال عَبْدٌ: لَا إِلَهَ إِلَّا اللهُ قَطُّ مُخْلِصًا إِلَّا فُتِحتْ لَهُ أَبْوَابُ السَّماء حَتَّى يُفْضِيَ إِلَى العَرْشِ مَا اجْتَنَبَ الكبَائِرَ".  

[ت] الترمذي حسن غريب عن أبي هريرة