This is an example of the case I was talking about.

He said he knew nothing about the matter.

Let's discuss this matter later.

Please read this contract and sign it.

The Ark of the Covenant is a sacred box described in the Old Testament.

Do you understand the necessity of this project?

That information is unnecessary.

That information is completely unnecessary.

He thinks that war is a necessary evil.

This treaty was concluded to strengthen the friendly relations between the two countries.