Matthew 17:13 KJV
Then the disciples understood that he spake unto them of John the Baptist.
Matthew 17:13, King James Version
In context
12 But 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.
13 Then the disciples understood that he spake unto them of John the Baptist.
14 And when they were come to the multitude, there came to him a certain man, kneeling down to him, and saying,