Treasury of Scripture Knowledge
Then Elijah, along with Moses, appeared to them and they were talking with Jesus.
Then suddenly two men were [seen] talking with Jesus. They were Moses and Elijah,
For all of the prophets and the law of Moses prophesied [of this kingdom] up until the time of John.
Then, beginning from [the writings of] Moses and all the prophets, Jesus explained to the two men about the things referring to Himself [contained] in all these Scripture passages.
For the law was given through Moses; [but] God's favor and truth came through Jesus Christ.
"Do not think that I will accuse you [of wrongdoing] before the Father; Moses, on whom you have set your hope [i.e., you base your acceptance with God on the promises found in Moses' writings], he is the one who accuses you [i.e., in his writings].
2 Corinthians 3:7
But if the ministry [of the law] that brings [spiritual] death, being carved in letters on stones, came with [such] splendor that the Israelites could not look at Moses' face because of its radiance [See Ex. 34:29-35], (even though such radiance [eventually] faded away),
Therefore, holy brothers [and sisters], who have been called [by God] to share in heaven, think about Jesus, the Apostle and Head Priest, whom we have confessed [as Savior].
His disciples asked Him, "Why then [since you are obviously the Messiah] do the experts in the law of Moses say that Elijah must come first, [i.e., before the Messiah]?"