The disciples asked Him, “Then why do the scribes say that Elijah must come first?”
And if you are willing to accept it, John himself is [the fulfillment of] Elijah [as the messenger] who was to come [before the kingdom]. [Mal 4:5]
And they answered, “Some say John the Baptist; others, Elijah; and still others, Jeremiah, or [just] one of the prophets.”
He answered and said, “Elijah is coming and will restore all things;
They asked Him, saying, “Why do the scribes say that Elijah must come first [before the Messiah comes]?” [Mal 4:5, 6]
They asked him, “What then? Are you Elijah?” And he said, “I am not.” “Are you the [promised] Prophet?” And he answered, “No.” [Deut 18:15, 18; Mal 4:5]
They asked him, “Why then are you baptizing, if you are not the Christ, nor Elijah, nor the Prophet?”