And they asked him, “Why do the scribes say that first Elijah must come?”
“Behold, I will send you Elijah the prophet before the great and terrible day of the Lord comes.
“Behold, I send 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, behold, he is coming, says the Lord of hosts.
and if you are willing to accept it, he is Elijah who is to come.
And there appeared to them Elijah with Moses; and they were talking to Jesus.
So they kept the matter to themselves, questioning what the rising from the dead meant.