Exodus 20:14 KJV

Deuteronomy 5:18 KJV
Neither shalt thou commit adultery.

Hebrews 13:4 KJV
Marriage is honourable in all, and the bed undefiled: but whoremongers and adulterers God will judge.

Romans 13:9 KJV
For this, Thou shalt not commit adultery, Thou shalt not kill, Thou shalt not steal, Thou shalt not bear false witness, Thou shalt not covet; and if there be any other commandment, it is briefly comprehended in this saying, namely, Thou shalt love thy neighbour as thyself.

Romans 7:2-3 KJV
For the woman which hath an husband is bound by the law to her husband so long as he liveth; but if the husband be dead, she is loosed from the law of her husband. So then if, while her husband liveth, she be married to another man, she shall be called an adulteress: but if her husband be dead, she is free from that law; so that she is no adulteress, though she be married to another man.