Romans 7:3

so then, the husband being alive, she shall be called an adulteress if she be to another man; but if the husband should die, she is free from the law, so as not to be an adulteress, though she be to another man.

Matthew 5:32

But I say unto you, that whosoever shall put away his wife, except for cause of fornication, makes her commit adultery, and whosoever marries one that is put away commits adultery.

Exodus 20:14

Thou shalt not commit adultery.

Leviticus 20:10

And a man that committeth adultery with a man's wife, who committeth adultery with his neighbour's wife, the adulterer and the adulteress shall certainly be put to death.

Numbers 5:13-31

and a man lie with her carnally, and it be hid from the eyes of her husband, and she be defiled in secret, and there be no witness against her, and she have not been caught;

Deuteronomy 22:22-24

If a man be found lying with a man's wife, they shall both of them die, the man that lay with the woman, and the woman; and thou shalt put away evil from Israel.

Ruth 2:13

And she said, Let me find favour in thine eyes, my lord; for that thou hast comforted me, and for that thou hast spoken kindly to thy handmaid, though I am not like one of thy handmaidens.

1 Samuel 25:39-42

And when David heard that Nabal was dead, he said, Blessed be Jehovah, who has pleaded the cause of my reproach from the hand of Nabal, and has kept back his servant from evil; but Jehovah has returned Nabal's evil upon his own head. And David sent and communed with Abigail, to take her as his wife.

Mark 10:6-12

but from the beginning of the creation God made them male and female.

John 8:3-5

And the scribes and the Pharisees bring to him a woman taken in adultery, and having set her in the midst,

1 Timothy 5:11-14

But younger widows decline; for when they grow wanton against 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
Thou shalt not commit adultery.
Leviticus 20:10
And a man that committeth adultery with a man's wife, who committeth adultery with his neighbour's wife, the adulterer and the adulteress shall certainly be put to death.
Numbers 5:13
and a man lie with her carnally, and it be hid from the eyes of her husband, and she be defiled in secret, and there be no witness against her, and she have not been caught;
Deuteronomy 22:22
If a man be found lying with a man's wife, they shall both of them die, the man that lay with the woman, and the woman; and thou shalt put away evil from Israel.
Matthew 5:32
But I say unto you, that whosoever shall put away his wife, except for cause of fornication, makes her commit adultery, and whosoever marries one that is put away commits adultery.
Mark 10:6
but from the beginning of the creation God made them male and female.
John 8:3
And the scribes and the Pharisees bring to him a woman taken in adultery, and having set her in the midst,

Though

Ruth 2:13
And she said, Let me find favour in thine eyes, my lord; for that thou hast comforted me, and for that thou hast spoken kindly to thy handmaid, though I am not like one of thy handmaidens.
1 Samuel 25:39
And when David heard that Nabal was dead, he said, Blessed be Jehovah, who has pleaded the cause of my reproach from the hand of Nabal, and has kept back his servant from evil; but Jehovah has returned Nabal's evil upon his own head. And David sent and communed with Abigail, to take her as his wife.
1 Timothy 5:11
But younger widows decline; for when they grow wanton against Christ, they desire to marry,

General references

Exodus 20:14
Thou shalt not commit adultery.
Mark 10:9
What therefore God has joined together, let not man separate.