Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
KJV

Matthew 17:12

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.

Parallel Translations

WEBView canonical →
but I tell you that Elijah has come already, and they didn’t recognize him, but did to him whatever they wanted to. Even so the Son of Man will also suffer by them.”
World English Bible
GNVView canonical →
But I say vnto you that Elias is come alreadie, and they knewe him not, but haue done vnto him whatsoeuer they would: likewise shall also the Sonne of man suffer of them.
Geneva Bible

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