Matthew 17:10-12

Young's Literal Translation

¹⁰ And his disciples questioned him, saying, `Why then do the scribes say that Elijah it behoveth to come first?'

¹¹ And Jesus answering said to them, `Elijah doth indeed come first, and shall restore all things,

¹² and I say to you -- Elijah did already come, and they did not know him, but did with him whatever they would, so also the Son of Man is about to suffer by them.'