Sulaiman bin Buraidah, I think, narrated from his father who said: The Messenger of Allah (peace be upon him) said: "There will be one hundred and twenty rows of the people of Paradise; eighty of them will be from my Ummah and forty from the rest of the people."
Hadith Takhrijاس حدیث کی سند صحیح ہے۔ دیکھئے: [ترمذي 2546] ، [ابن ماجه 4289] ، [ابن حبان 7459] ، [موارد الظمآن 2638، وله شاهد عند أبى يعلی 5358]
Brief Explanation
(Commentary on Hadith 2868)
From this hadith, it is understood that the number of the Ummah of Muhammad (sallallahu alayhi wa sallam) in Paradise will be very great; rather, two-thirds will be Muslims and one-third will be people from other communities. Even in this world, the followers of the Prophet (sallallahu alayhi wa sallam) are more than the followers of all other prophets, and in the Hereafter as well, they will be the most numerous.