Genesis 2:24
Therefore shall a man leave his father and his mother, and shall cleave unto his wife: and they shall be one flesh.

Genesis 19:5
And they called unto Lot, and said unto him, Where are the men which came in to thee this night? bring them out unto us, that we may know them.

Genesis 19:13
For we will destroy this place, because the cry of them is waxen great before the face of the LORD; and the LORD hath sent us to destroy it.

Genesis 26:8,9
And it came to pass, when he had been there a long time, that Abimelech king of the Philistines looked out at a window, and saw, and, behold, Isaac was sporting with Rebekah his wife.
And Abimelech called Isaac, and said, Behold, of a surety she is thy wife; and how saidst thou, She is my sister? And Isaac said unto him, Because I said, Lest I die for her.

Leviticus 18:1-30
And the LORD spake unto Moses, saying,
Speak unto the children of Israel, and say unto them, I am the LORD your God.
After the doings of the land of Egypt, wherein ye dwelt, shall ye not do: and after the doings of the land of Canaan, whither I bring you, shall ye not do: neither shall ye walk in their ordinances.
Ye shall do my judgments, and keep mine ordinances, to walk therein: I am the LORD your God.
Ye shall therefore keep my statutes, and my judgments: which if a man do, he shall live in them: I am the LORD.
None of you shall approach to any that is near of kin to him, to uncover their nakedness: I am the LORD.
The nakedness of thy father, or the nakedness of thy mother, shalt thou not uncover: she is thy mother; thou shalt not uncover her nakedness.
The nakedness of thy father's wife shalt thou not uncover: it is thy father's nakedness.
The nakedness of thy sister, the daughter of thy father, or daughter of thy mother, whether she be born at home, or born abroad, even their nakedness thou shalt not uncover.
The nakedness of thy son's daughter, or of thy daughter's daughter, even their nakedness thou shalt not uncover: for theirs is thine own nakedness.
The nakedness of thy father's wife's daughter, begotten of thy father, she is thy sister, thou shalt not uncover her nakedness.
Thou shalt not uncover the nakedness of thy father's sister: she is thy father's near kinswoman.
Thou shalt not uncover the nakedness of thy mother's sister: for she is thy mother's near kinswoman.
Thou shalt not uncover the nakedness of thy father's brother, thou shalt not approach to his wife: she is thine aunt.
Thou shalt not uncover the nakedness of thy daughter in law: she is thy son's wife; thou shalt not uncover her nakedness.
Thou shalt not uncover the nakedness of thy brother's wife: it is thy brother's nakedness.
Thou shalt not uncover the nakedness of a woman and her daughter, neither shalt thou take her son's daughter, or her daughter's daughter, to uncover her nakedness; for they are her near kinswomen: it is wickedness.
Neither shalt thou take a wife to her sister, to vex her, to uncover her nakedness, beside the other in her life time.
Also thou shalt not approach unto a woman to uncover her nakedness, as long as she is put apart for her uncleanness.
Moreover thou shalt not lie carnally with thy neighbour's wife, to defile thyself with her.
And thou shalt not let any of thy seed pass through the fire to Molech, neither shalt thou profane the name of thy God: I am the LORD.
Thou shalt not lie with mankind, as with womankind: it is abomination.
Neither shalt thou lie with any beast to defile thyself therewith: neither shall any woman stand before a beast to lie down thereto: it is confusion.
Defile not ye yourselves in any of these things: for in all these the nations are defiled which I cast out before you:
And the land is defiled: therefore I do visit the iniquity thereof upon it, and the land itself vomiteth out her inhabitants.
Ye shall therefore keep my statutes and my judgments, and shall not commit any of these abominations; neither any of your own nation, nor any stranger that sojourneth among you:
(For all these abominations have the men of the land done, which were before you, and the land is defiled;)
That the land spue not you out also, when ye defile it, as it spued out the nations that were before you.
For whosoever shall commit any of these abominations, even the souls that commit them shall be cut off from among their people.
Therefore shall ye keep mine ordinance, that ye commit not any one of these abominable customs, which were committed before you, and that ye defile not yourselves therein: I am the LORD your God.

Romans 1:26-29
For this cause God gave them up unto vile affections: for even their women did change the natural use into that which is against nature:
And likewise also the men, leaving the natural use of the woman, burned in their lust one toward another; men with men working that which is unseemly, and receiving in themselves that recompence of their error which was meet.
And even as they did not like to retain God in their knowledge, God gave them over to a reprobate mind, to do those things which are not convenient;
Being filled with all unrighteousness, fornication, wickedness, covetousness, maliciousness; full of envy, murder, debate, deceit, malignity; whisperers,

I Corinthians 5:1
It is reported commonly that there is fornication among you, and such fornication as is not so much as named among the Gentiles, that one should have his father's wife.

I Corinthians 6:9
Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind,

I Thessalonians 4:1-8
Furthermore then we beseech you, brethren, and exhort you by the Lord Jesus, that as ye have received of us how ye ought to walk and to please God, so ye would abound more and more.
For ye know what commandments we gave you by the Lord Jesus.
For this is the will of God, even your sanctification, that ye should abstain from fornication:
That every one of you should know how to possess his vessel in sanctification and honour;
Not in the lust of concupiscence, even as the Gentiles which know not God:
That no man go beyond and defraud his brother in any matter: because that the Lord is the avenger of all such, as we also have forewarned you and testified.
For God hath not called us unto uncleanness, but unto holiness.
He therefore that despiseth, despiseth not man, but God, who hath also given unto us his holy Spirit.

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