Then they asked him, “Why do the scribes say that Elijah must come first?”
See, I am sending my messenger to prepare the way before me, and the Lord whom you seek will suddenly come to his temple. The messenger of the covenant in whom you delight—indeed, he is coming, says the Lord of hosts.
See, I will send you the prophet Elijah before the great and terrible day of the Lord comes.
and if you are willing to accept it, he is Elijah who is to come.
So they kept the matter to themselves, questioning what this rising from the dead could mean.
And there appeared to them Elijah with Moses, who were talking with Jesus.