Therefore shall a man leave his father and his mother, and shall cleave unto his wife: and they shall be one flesh.
1 Corinthians 6:18Flee fornication. Every sin that a man doeth is without the body; but he that committeth fornication sinneth against his own body.
Hebrews 10:26For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins,