question #1 Sahih Muslim 156, Book 1, Hadith 300 : What is the significance of continuous struggle for truth in Islam until the Day of Resurrection?

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.