John the Apostle
John 1:21ESV·traditional attribution

And they asked him, “What then? Are you Elijah?” He said, “I am not.” “Are you the Prophet?” And he answered, “No.”

John Calvin Reformed @genevareformer

21. Art thou Elijah? Why do they name Elijah rather than Moses? It was because they learned from the prediction of Malachi 4:2, 5, that when the Messiah, the Sun of Righteousness, should arise, Elijah would be the morning star to announce his approach.

Matthew Henry Presbyterian @wholebiblehenry

We have here the testimony of John, which he delivered to the messengers who were sent from Jerusalem to examine him. Observe here, I. Who they were that sent to him, and who they were that were sent. 1. They that sent to him were the Jews at Jerusalem, the great sanhedrim or high-commission court, which sat at Jerusalem, and was the representative of the...

Commenting on John 1:19-28

John Gill Reformed Baptist @doctorgill

And they asked him, what then? art thou Elias?.... Elijah, the prophet; the Tishbite, as Nonnus in his paraphrase expresses it; who was translated, soul and body, to heaven: the Jews had a notion that that prophet would come in person a little before the coming of the Messiah; See Gill on Mat 17:10 wherefore these messengers inquire, that since he had so fully satisfied...