GOD'S WORD® Translation
They didn't know that Joseph could understand them, because he was speaking through an interpreter.

American Standard Version
And they knew not that Joseph understood them; for there was an interpreter between them.

Berean Study Bible
They did not realize that Joseph understood them, since there was an interpreter between them.

Douay-Rheims Bible
And they knew not that Joseph understood, because he spoke to them by an interpreter.

English Revised Version
And they knew not that Joseph understood them; for there was an interpreter between them.

King James Bible
And they knew not that Joseph understood them; for he spake unto them by an interpreter.

World English Bible
They didn't know that Joseph understood them; for there was an interpreter between them.

Young's Literal Translation
And they have not known that Joseph understandeth, for the interpreter is between them;

Genesis 42:23 Additional Translations ...