Sahih Muslim 156
The Book of Faith
The descent of 'Eisa bin Mariam to judge according to the Shari'ah of our Prophet (ﷺ) Muhammad (ﷺ); And how Allah has honored this Ummah; And clarifying the evidence that this religion will not be abrogated; and that a group from it will continue to adhere to the truth and prevail until the day of resurrection
Jabir b. 'Abdullah reported: I heard the Messenger of Allah (ﷺ) say: A section of my people will not cease fighting for the Truth and will prevail till the Day of Resurrection. He said: Jesus son of Mary would then descend and their (Muslims') commander would invite him to come and lead them in prayer, but he would say: No, some amongst you are commanders over some (amongst you). This is the honour from Allah for this Ummah.