And Elijah appeared to them with Moses, and they were talking with Jesus.

Behold, I send My messenger, and He will prepare the way before Me. And the Lord whom you seek shall suddenly come to His temple, even the Messenger of the Covenant, in whom you delight. Behold, He comes, says Jehovah of Hosts.

Behold, I am sending you Elijah the prophet before the coming of the great and dreadful day of Jehovah.

And if you are willing to receive it, he is Elijah who is to come.

And His disciples asked Him, saying, Why then do the scribes say that Elijah must come first?

And Jesus answered and said to them, Indeed, Elijah is coming first and will restore all things.