10 And the disciples asked him, “Then why do the scribes say that first Elijah must come?” 11 He replied, “Elijah does come, and he is to restore all things; 12 but I tell you that Elijah has already come, and they did not know him, but did to him whatever they pleased. So also the Son of man will suffer at their hands.” 13 Then the disciples understood that he was speaking to them of John the Baptist.