Romans 7:3

Accordingly, she will be termed an adulteress if she becomes another man's while her husband is alive; but if her husband dies, she is freed from the law of 'the husband,' so that she is no adulteress if she becomes another man's.

Matthew 5:32

But I tell you, anyone who divorces his wife for any reason except unchastity makes her an adulteress; and whoever marries a divorced woman commits adultery.

Mark 10:6-12

But from the beginning, when God created the world, Male and female, He created them:

John 8:3-5

The scribes and Pharisees brought a woman who had been caught in the act of committing adultery, and making her stand forward

1 Timothy 5:11-14

Refuse to put young widows on the list, for when their wanton desires alienate them from Christ, they want 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

Matthew 5:32
But I tell you, anyone who divorces his wife for any reason except unchastity makes her an adulteress; and whoever marries a divorced woman commits adultery.
Mark 10:6
But from the beginning, when God created the world, Male and female, He created them:
John 8:3
The scribes and Pharisees brought a woman who had been caught in the act of committing adultery, and making her stand forward

Though

1 Timothy 5:11
Refuse to put young widows on the list, for when their wanton desires alienate them from Christ, they want to marry

General references

Mark 10:9
What God has joined, then, man must not separate."