Berean Study Bible
He said this to indicate the kind of death He was going to die.

King James Bible
This he said, signifying what death he should die.

American Standard Version
But this he said, signifying by what manner of death he should die.

Darby Bible Translation
But this he said signifying by what death he was about to die.

Douay-Rheims Bible
(Now this he said, signifying what death he should die.)

English Revised Version
But this he said, signifying by what manner of death he should die.

Young's Literal Translation
And this he said signifying by what death he was about to die;