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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

See similar narrations below:

Collected by Aḥmad, Suyūṭī
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