GOD'S WORD® Translation
Actually, I can guarantee that Elijah has already come. Yet, people treated him as they pleased because they didn't recognize him. In the same way they're going to make the Son of Man suffer."

American Standard Version
but I say into you, that Elijah is come already, and they knew him not, but did unto him whatsoever they would. Even so shall the Son of man also suffer of them.

Berean Study Bible
But I tell you that Elijah has already come, and they did not recognize him, but have done to him whatever they wished. In the same way, the Son of Man will suffer at their hands.”

Douay-Rheims Bible
But I say to you, that Elias is already come, and they knew him not, but have done unto him whatsoever they had a mind. So also the Son of man shall suffer from them.

English Revised Version
but I say unto you, that Elijah is come already, and they knew him not, but did unto him whatsoever they listed. Even so shall the Son of man also suffer of them.

King James Bible
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.

World English Bible
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."

Young's Literal Translation
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.'

Matthew 17:12 Additional Translations ...