Sahih Muslim 1037
Sahih Muslim · Book 33: The Book on Government · The words of the prophet saws: "A Group of my Ummah will continue to Prevail on the basis of the Truth, and They will not be Harmed by those who oppose them."
وَحَدَّثَنِي إِسْحَاقُ بْنُ مَنْصُورٍ ، أَخْبَرَنَا كَثِيرُ بْنُ هِشَامٍ ، حَدَّثَنَا جَعْفَرٌ، - وَهُوَ ابْنُ بُرْقَانَ - حَدَّثَنَا يَزِيدُ بْنُ الأَصَمِّ ، قَالَ سَمِعْتُ مُعَاوِيَةَ بْنَ أَبِي سُفْيَانَ ، ذَكَرَ حَدِيثًا رَوَاهُ عَنِ النَّبِيِّ صلى الله عليه وسلم لَمْ أَسْمَعْهُ رَوَى عَنِ النَّبِيِّ صلى الله عليه وسلم عَلَى مِنْبَرِهِ حَدِيثًا غَيْرَهُ قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَنْ يُرِدِ اللَّهُ بِهِ خَيْرًا يُفَقِّهْهُ فِي الدِّينِ وَلاَ تَزَالُ عِصَابَةٌ مِنَ الْمُسْلِمِينَ يُقَاتِلُونَ عَلَى الْحَقِّ ظَاهِرِينَ عَلَى مَنْ نَاوَأَهُمْ إِلَى يَوْمِ الْقِيَامَةِ " .
It has been related by, Yazid b. al-Asamm that he heard Mu'awiya b. Abu Sfyan quote a tradition from the Prophet (ﷺ) which he related from the Prophet (mail peace he upon him) -and he did not hear him quote from the Prophet (masy peace be upon him) any tradition other than this in the course of his sermon from the pulpit-that whom Allah wants to do a favour, He grants him an understanding of religion. A group of people from the Muslims will remain on the Right Path and continue until the Day of Judgment to triumph over those who oppose them.