Albert Barnes' Notes on the Whole Bible - Matthew 17:10-13
See also Mark 9:11-13.Why then say the scribes ... - The disciples appear to have been satisfied now that he was the Messiah. The transfiguration had taken away all their doubts, but they recollected that it was a common doctrine among the Jews that Elijah would appear before the Messiah came, and they did not then recollect that he had appeared. To this difficulty the word then refers. “We are satisfied that thou art the Christ, but Elijah has not yet come, as was expected; what, then, is the... read more
The Pulpit Commentary - Matthew 17:11
The coming of Elias. It is difficult for us to realize the general conviction of our Lord's time, that the Prophet Elijah was about to reappear. "Elijah was the prophet for whose return in later years his countrymen have looked with most eager hope It was a fixed belief of the Jews that he had appeared again and again, as an Arabian merchant, to wise and good rabbis at their prayers or on their journeys. A seat is still placed for him to superintend the circumcision of the Jewish children.... read more