Leviticus 18:6-18
None of you are to approach any close relative to have sexual relations. I am the LORD. / You must not expose the nakedness of your father by having sexual relations with your mother. She is your mother; you must not have sexual relations with her. / You must not have sexual relations with your father’s wife; it would dishonor your father. ...

Deuteronomy 23:2
No one of illegitimate birth may enter the assembly of the LORD, nor may any of his descendants, even to the tenth generation.

2 Samuel 13:1-14
After some time, David’s son Amnon fell in love with Tamar, the beautiful sister of David’s son Absalom. / Amnon was sick with frustration over his sister Tamar, for she was a virgin, and it seemed implausible for him to do anything to her. / Now Amnon had a friend named Jonadab, the son of David’s brother Shimeah. Jonadab was a very shrewd man, ...

Judges 11:1-2
Now Jephthah the Gileadite was a mighty man of valor; he was the son of a prostitute, and Gilead was his father. / And Gilead’s wife bore him sons who grew up, drove Jephthah out, and said to him, “You shall have no inheritance in our father’s house, because you are the son of another woman.”

Ruth 4:10
Moreover, I have acquired Ruth the Moabitess, Mahlon’s widow, as my wife, to raise up the name of the deceased through his inheritance, so that his name will not disappear from among his brothers or from the gate of his home. You are witnesses today.”

1 Kings 11:1-2
King Solomon, however, loved many foreign women along with the daughter of Pharaoh—women of Moab, Ammon, Edom, and Sidon, as well as Hittite women. / These women were from the nations about which the LORD had told the Israelites, “You must not intermarry with them, for surely they will turn your hearts after their gods.” Yet Solomon clung to these women in love.

Nehemiah 13:23-27
In those days I also saw Jews who had married women from Ashdod, Ammon, and Moab. / Half of their children spoke the language of Ashdod or of the other peoples, but could not speak the language of Judah. / I rebuked them and called down curses on them. I beat some of these men and pulled out their hair. Then I made them take an oath before God and said, “You must not give your daughters in marriage to their sons or take their daughters as wives for your sons or for yourselves! ...

Psalm 51:5
Surely I was brought forth in iniquity; I was sinful when my mother conceived me.

Proverbs 6:32
He who commits adultery lacks judgment; whoever does so destroys himself.

Ezekiel 16:44-45
Behold, all who speak in proverbs will quote this proverb about you: ‘Like mother, like daughter.’ / You are the daughter of your mother, who despised her husband and children. You are the sister of your sisters, who despised their husbands and children. Your mother was a Hittite and your father an Amorite.

Matthew 1:5
Salmon was the father of Boaz by Rahab, Boaz the father of Obed by Ruth, Obed the father of Jesse,

Matthew 1:18
This is how the birth of Jesus Christ came about: His mother Mary was pledged in marriage to Joseph, but before they came together, she was found to be with child through the Holy Spirit.

Luke 3:32
the son of Jesse, the son of Obed, the son of Boaz, the son of Sala, the son of Nahshon,

John 8:41
You are doing the works of your father.” “We are not illegitimate children,” they declared. “Our only Father is God Himself.”

Acts 15:20
Instead, we should write and tell them to abstain from food polluted by idols, from sexual immorality, from the meat of strangled animals, and from blood.