'Adultery' in the Bible

Ye have heard that it was said, Thou shalt not commit adultery:

but I say unto you, that every one that looketh on a woman to lust after her hath committed adultery with her already in his heart.

but I say unto you, that every one that putteth away his wife, saving for the cause of fornication, maketh her an adulteress: and whosoever shall marry her when she is put away committeth adultery.

And I say unto you, Whosoever shall put away his wife, except for fornication, and shall marry another, committeth adultery: and he that marrieth her when she is put away committeth adultery.

He saith unto him, Which? And Jesus said, Thou shalt not kill, Thou shalt not commit adultery, Thou shalt not steal, Thou shalt not bear false witness,