Genesis 42:23

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

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

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

And they have not known that Joseph understandeth, for the interpreter `is' between them;

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