From Sahih Bukhari (Hadith 3641):
Narrated Muawiya:I heard the Prophet (ﷺ) saying, "A group of people amongst my followers will remain obedient to Allah's orders and they will not be harmed by anyone who will not help them or who will oppose them, till Allah's Order (the Last Day) comes upon them while they are still on the right path
Reference: Bukhari 3641