Parallel
Matthew 11:14
Patriarchal Greek New Testament (1904) · Berean Standard Bible
καὶ εἰ θέλετε δέξασθαι, αὐτός ἐστιν Ἠλίας ὁ μέλλων ἔρχεσθαι.
And if you are willing to accept it, he is the Elijah who was to come (note: See Malachi 4:5.).