Matthew 17:13

13 Then the disciples understood that He spoke to them about John the Baptist.

Matthew 17:13 Meaning and Commentary

Matthew 17:13

Then the disciples understood
By his saying that Elias was come, and by the account he gave of his ill usage, it was clear to them,

that he spake unto them of John the Baptist;
and that he was the Elias that was to come, and was come: so that this observation, that according to prophecy Elias was to come before the Messiah, was no objection to Jesus being the Messiah; but on the contrary, since he that was intended by Elias was come, and had done his work and office, it was a confirmation of the truth of his Messiahship.

Matthew 17:13 In-Context

11 "Elijah is coming and will restore everything," He replied.
12 "But I tell you: Elijah has already come, and they didn't recognize him. On the contrary, they did whatever they pleased to him. In the same way the Son of Man is going to suffer at their hands."
13 Then the disciples understood that He spoke to them about John the Baptist.
14 When they reached the crowd, a man approached and knelt down before Him.
15 "Lord," he said, "have mercy on my son, because he has seizures and suffers severely. He often falls into the fire and often into the water.
Holman Christian Standard Bible ® Copyright © 2003, 2002, 2000, 1999 by Holman Bible Publishers.  Used by permission.  All rights reserved.