Romans 7:3

So then if, while the husband lives, she is joined to another man, she will be called an adulteress. If the husband dies, she is free from the law, so that she is no adulteress, though she is joined to another man.

Matthew 5:32

I say to you that everyone divorcing his wife, except for the reason of fornication, makes her liable to commit adultery. And if she marries again, the man she marries also commits adultery.

Exodus 20:14

Do not commit adultery.

Leviticus 20:10

If a man commits adultery with the wife of an Israelite, both he and the woman should be put to death.

Numbers 5:13-31

and may have had sexual intercourse with another man without her husband's knowledge. She may have kept it secret if there were no witnesses to accuse her and she was not caught in the act.

Deuteronomy 22:22-24

If a man is caught having sexual intercourse with another mans wife, then both of them shall die! Both the man and the woman committing adultery must be killed. Thus you shall purge the evil from Israel.

Ruth 2:13

Ruth answered: You are very kind to me, sir. You make me feel better by speaking gently to me, even though I do not even have the standing of one of your servants.

1 Samuel 25:39-42

David heard Nabal was dead. He said: Blessed is Jehovah who defended me against the insults of Nabal. He kept me from doing wrong. Jehovah has turned Nabal's own wickedness back on him. David sent men on his behalf to propose marriage to Abigail.

Mark 10:6-12

God made male and female from the beginning of creation.

1 Timothy 5:11-14

Refuse younger widows: for when their sexual impulses come between them and Christ, they desire to marry.

Treasury of Scripture Knowledge

Summary

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.

General references

Bible References

So then

Exodus 20:14
Do not commit adultery.
Leviticus 20:10
If a man commits adultery with the wife of an Israelite, both he and the woman should be put to death.
Numbers 5:13
and may have had sexual intercourse with another man without her husband's knowledge. She may have kept it secret if there were no witnesses to accuse her and she was not caught in the act.
Deuteronomy 22:22
If a man is caught having sexual intercourse with another mans wife, then both of them shall die! Both the man and the woman committing adultery must be killed. Thus you shall purge the evil from Israel.
Matthew 5:32
I say to you that everyone divorcing his wife, except for the reason of fornication, makes her liable to commit adultery. And if she marries again, the man she marries also commits adultery.
Mark 10:6
God made male and female from the beginning of creation.

Though

Ruth 2:13
Ruth answered: You are very kind to me, sir. You make me feel better by speaking gently to me, even though I do not even have the standing of one of your servants.
1 Samuel 25:39
David heard Nabal was dead. He said: Blessed is Jehovah who defended me against the insults of Nabal. He kept me from doing wrong. Jehovah has turned Nabal's own wickedness back on him. David sent men on his behalf to propose marriage to Abigail.
1 Timothy 5:11
Refuse younger widows: for when their sexual impulses come between them and Christ, they desire to marry.

General references

Exodus 20:14
Do not commit adultery.
Mark 10:9
That which God has joined together let not man take apart (separate).