Bible Question:

I am married to a first cousin and a couple of Christian friends told her that this is not allowed in the Bible, and that our child will not be born without abnormalities. What does the Bible say?

Bible Answer:

The best list of marriages that are prohibited by God can be found in the book of Leviticus. The passage is Leviticus 18:6-17. It is concerned with incest. The opening verse is,

None of you shall approach any blood relative of his to uncover nakedness; I am the LORD. (NASB) Lev. 18:6

The literal Hebrew translation of this passage is as follows:

Any man to all blood relative not come near to uncover nakedness, I am the Lord.

The blood relatives are defined in Leviticus 21:2-3. The passage speaks from a male perspective and includes mother, father, sons, daughters, brother, and one’s virgin sister. The reverse would be true for a women. The expression “To come near” has the idea of approaching a person for the purpose of sexual relations. The Hebrew words for “uncover nakedness” imply sexual relations. Ezekiel 16:36 makes this clear. Here is the list from Leviticus. The New Living Translation has captured the meaning very accurately,

You must never have sexual relations with a close relative, for I am the Lord. (NLT) Lev. 18:6

Therefore, Leviticus 18:6 prohibits all sexual relations, including those listed above, and the ones listed in verses 7-17. The table below provides a complete list. Note: the prohibitions are addressed to men. The reverse applies to women.

Forbidden MarriagesPassage
Between mother and son. (Note that sexual relations between father and daughter are prohibited by Lev. 18:6 and 21:2-3)Leviticus 18:7-8
With stepchildren.Leviticus 18:8, 17
With an aunt.Leviticus 18:12-14
With sister or half-sister.Leviticus 18:9; Deut. 27:22
With half-sister and stepsisters.Leviticus 18:11
With daughter-in-law.Leviticus 18:15
With your sister-in-law.Leviticus 18:16
With your granddaughter.Leviticus 18:10
With your step-granddaughter.Leviticus 18:17

This is a complete list of the marriages that God forbids. This list includes those found in Leviticus 20:11-21; Deuteronomy 22:30; Deuteronomy 27:20-23; and 1 Corinthians 5:1. But marriage with a first cousin is not prohibited. It should be noted that God does not prohibit marriage with a brother’s wife in the case of a Leverite marriage (Deut. 25:10). Before God established these laws, marriage between brothers and sisters was allowed. For example, Abraham married his half-sister (Gen. 20:12).


Scripture does not prohibit marriage between first-cousins. Yet, there are several things to consider. First, it would be a serious error to say more than what scripture has said or to add to scripture. Second, we are assuming that when you married in the United States, you did not violate any of the laws in the state in which you were married. If you are not sure, we would encourage you to check with a lawyer in that state. Here is a general summary of United States law regarding marriage from Law Connect!™, but it is important to remember that the laws vary from one state to another.

In most states, the parties must be of the age of majority (18) to enter into a valid state of marriage . . . For individuals below the age of majority, parental consent is ordinarily required. Uncles and aunts may not marry nieces and nephews; in some states, first cousins are invalid. Marriages between persons who are closely related by blood are void- it is as if the marriage never took place. State statutes that prohibit marriages between different races have been declared unconstitutional. In addition to physical requirements, the parties to a marriage . . . must also have the mental capacity ordinarily required to enter into a contract. If one of the parties lacks the necessary mental capacity, an action (lawsuit) for annulment to void the marriage can be brought.

This legal summary says that your marriage may not be valid or recognized in the state in which you were married if your state has laws prohibiting first-cousins from marrying. Third, assuming your marriage is valid, I would encourage you to consult with a medical doctor and seek advice about the wisdom of having children. He will be the best person to advise you. If he is discouraging, then I would encourage you to consider adoption.