'Necessary' in the Bible

They asked Him, saying, “Why do the scribes say that Elijah must come first [before the Messiah comes]?”

When you hear of wars and rumors of wars, do not be alarmed (frightened, troubled); these things must take place, but the end is not yet.

But Peter kept saying insistently, “If I have to die with You, I will not deny You!” And they all were saying the same thing as well.