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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  

See similar narrations below:

Collected by Tirmidhī, 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  

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