KJV(i)
10 And his disciples asked him, saying, Why then say the scribes that Elias must first come?
11 And Jesus answered and said unto them, Elias truly shall first come, and restore all things.
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.
Matthew 17:10-13
RKJNT(i)
10 And his disciples asked him, saying, Why then do the scribes say that Elijah must come first?
11 And Jesus answered them, Elijah truly shall come first, and restore all things.
12 But I say to you, That Elijah has already come, and they did not know him, but have done to him whatever they pleased. Likewise shall the Son of man suffer at their hands.
13 Then the disciples understood that he spoke to them of John the Baptist.