Hadithcore
Sahih Muslim, 1922
sahih

It has been narrated on the authority of Jabir b. Samura that the Prophet (ﷺ) said:

This religion will continue to exist, and a group of people from the Muslims will continue to fight for its protection until the Hour is established.

وَحَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، وَمُحَمَّدُ بْنُ بَشَّارٍ، قَالاَ حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، حَدَّثَنَا شُعْبَةُ، عَنْ سِمَاكِ بْنِ حَرْبٍ، عَنْ جَابِرِ بْنِ سَمُرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم أَنَّهُ قَالَ ‏

‏ لَنْ يَبْرَحَ هَذَا الدِّينُ قَائِمًا يُقَاتِلُ عَلَيْهِ عِصَابَةٌ مِنَ الْمُسْلِمِينَ حَتَّى تَقُومَ السَّاعَةُ ‏

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References2 variants
In-Book Reference
Book 33, Hadith 248
USC-MSA web (English) reference
Book 20, Hadith 4717 (deprecated numbering scheme)