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:10462a –
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السيوطي:١٠٤٦٢a –

"الْجَنَّةُ مائةُ درجة، ولو أن العَالمِينَ اجْتَمُعوا في إِحدَاهُنَّ وَسِعَتْهُم".  

[حم] أحمد [ت] الترمذي [ع] أبو يعلى عن أَبي سعيد

See similar narrations below:

Collected by Tirmidhī, Aḥmad, Suyūṭī
tirmidhi:2532 – Qutaybah > Ibn Lahīʿah > Darrāj Abū al-Samḥ > Abū al-Haytham > Abū Saʿīd

"Indeed there are a hundred levels in Paradise, if all of the People of Paradise were to be gathered in one of them, it would have sufficed them."  

Abū ʿĪsá said that this Ḥadīth is Gharīb.
الترمذي:٢٥٣٢ – حَدَّثَنَا قُتَيْبَةُ حَدَّثَنَا ابْنُ لَهِيعَةَ عَنْ دَرَّاجٍ أَبِي السَّمْحِ عَنْ أَبِي الْهَيْثَمِ عَنْ أَبِي سَعِيدٍ

عَنِ النَّبِيِّ ﷺ قَالَ إِنَّ فِي الْجَنَّةِ مِائَةَ دَرَجَةٍ لَوْ أَنَّ الْعَالَمِينَ اجْتَمَعُوا فِي إِحْدَاهُنَّ لَوَسِعَتْهُمْ  

قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ غَرِيبٌ
ahmad:11236 –

"Indeed there are a hundred levels in Paradise, if all of the People of Paradise were to be gathered in one of them, it would have sufficed them." (Using translation from Tirmidhī 2532)   

أحمد:١١٢٣٦ –

وَقَالَ رَسُولُ اللهِ ﷺ إِنَّ لِلْجَنَّةِ مِائَةَ دَرَجَةٍ لَوْ أَنَّ الْعَالَمِينَ اجْتَمَعُوا فِي إِحْدَاهُنَّ وَسِعَتْهُمْ