Matthew 11:14 - Ellicott's Commentary On The Whole Bible

This is Elias. — The words of Malachi (Malachi 4:5) had led men to expect the reappearance of the great Tishbite in person as the immediate precursor of the Christ. It was the teaching of the scribes then (Matthew 17:10; John 1:21); it has lingered as a tradition of Judaism down to our own time. A vacant chair is placed for Elijah at all great solemnities. Even Christian interpreters have cherished the belief that Elijah will appear in person before the second Advent of the Lord. The true meaning of the words of Malachi had, however, been suggested in the words of the angel in Luke 1:17, “He shall go before Him in the spirit and power of Elias,” and is here distinctly confirmed. The words “if ye will (i.e., are willing to) receive it” imply the consciousness that our Lord was setting aside a popular and strongly-fixed belief: “If you are willing and able to receive the truth that John was in very deed doing the work of Elijah, you need look for no other in the future.”