'Fornication' in the Bible

It is universally reported that there is fornication among you, and such fornication as is not even among the nations, so that one should have his father's wife.

Meats for the belly, and the belly for meats; but God will bring to nothing both it and them: but the body is not for fornication, but for the Lord, and the Lord for the body.

Flee fornication. Every sin which a man may practise is without the body, but he that commits fornication sins against his own body.

Neither let us commit fornication, as some of them committed fornication, and fell in one day three and twenty thousand.