Matthew 17:10

7 And Jesus came and put his hand on them and said, Get up and have no fear.

8 And lifting up their eyes, they saw no one, but Jesus only.

9 And when they were coming down from the mountain, Jesus gave them orders, saying, Let no man have word of what you have seen, till the Son of man has come again from the dead.

10 And his disciples, questioning him, said, Why then do the scribes say that Elijah has to come first?

11 And in answer he said, Elijah truly has to come and put all things right:

12 But I say to you that Elijah has come, and they had no knowledge of him, but did to him whatever they were pleased to do; the same will the Son of man undergo at their hands.

13 Then the disciples saw that he was talking to them of John the Baptist.