'Cases' in the Bible

For, in such cases, the unbelieving husband has become--and is--holy through union with a Christian woman, and the unbelieving wife is holy through union with a Christian brother. Otherwise your children would be unholy, but in reality they have a place among God's people.

and that in this matter there be no encroaching on the rights of a brother Christian and no overreaching him. For the Lord is an avenger in all such cases, as we have already taught you and solemnly warned you.