Then they asked him, “Why do the scribes say that Elijah must come first?”
Now I am sending my messenger— he will prepare the way before me; And the lord whom you seek will come suddenly to his temple; The messenger of the covenant whom you desire— see, he is coming! says the Lord of hosts.
And if you are willing to accept it, he is Elijah, the one who is to come.
So they kept the matter to themselves, questioning what rising from the dead meant.
Then Elijah appeared to them along with Moses, and they were conversing with Jesus.