And they asked Him, saying, “Why do the scribes say that Elijah must come first?”
Behold, I will send you Elijah the prophet Before the coming of the great and dreadful day of the Lord.
“Behold, I send My messenger, And he will prepare the way before Me. And the Lord, whom you seek, Will suddenly come to His temple, Even the Messenger of the covenant, In whom you delight. Behold, He is coming,” Says the Lord of hosts.
And if you are willing to receive it, he is Elijah who is to come.
And Elijah appeared to them with Moses, and they were talking with Jesus.
So they kept this word to themselves, questioning what the rising from the dead meant.