Sahih Bukhari Volume 8, Book 81, Hadith 6556

حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا عَبْدُ الْعَزِيزِ، عَنْ أَبِي حَازِمٍ، عَنْ سَهْلِ بْنِ سَعْدٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ لَيَدْخُلَنَّ الْجَنَّةَ مِنْ أُمَّتِي سَبْعُونَ أَوْ سَبْعُمِائَةِ أَلْفٍ ـ لاَ يَدْرِي أَبُو حَازِمٍ أَيُّهُمَا قَالَ ـ مُتَمَاسِكُونَ، آخِذٌ بَعْضُهُمْ بَعْضًا، لاَ يَدْخُلُ أَوَّلُهُمْ حَتَّى يَدْخُلَ آخِرُهُمْ، وُجُوهُهُمْ عَلَى صُورَةِ الْقَمَرِ لَيْلَةَ الْبَدْرِ ‏"‏‏.‏

Narrated By Sahl bin Sa'd : Allah's Apostle said, "Seventy thousand or seven hundred thousand of my followers will enter Paradise. (Abu Hazim, the sub-narrator, is not sure as to which of the two numbers is correct.) And they will be holding on to one another, and the first of them will not enter till the last of them has entered, and their faces will be like the moon on a full moon night."