TSK · John 1:21

Behold, I will send you Elijah the prophet before the great and terrible day of Yahweh comes.

If you are willing to receive it, this is Elijah, who is to come.

His disciples asked him, saying, "Then why do the scribes say that Elijah must come first?"

They asked him, "Why then do you baptize, if you are not the Christ, nor Elijah, nor the prophet?"