Matthew 17:13
King James Version
“Then the disciples understood that he spake unto them of John the Baptist.”
Context
10And his disciples asked him, saying, Why then say the scribes that Elias must first come?
11And Jesus answered and said unto them, Elias truly shall first come, and restore all things.
12But I say unto you, That Elias is come already, and they knew him not, but have done unto him whatsoever they listed. Likewise shall also the Son of man suffer of them.
13Then the disciples understood that he spake unto them of John the Baptist.
14And when they were come to the multitude, there came to him a man, kneeling down to him, and saying,
15Lord, have mercy on my son: for he is lunatick, and sore vexed: for ofttimes he falleth into the fire, and oft into the water.
16And I brought him to thy disciples, and they could not cure him.