Romans 7:3

Therefore while her husband is living, she shall be called an adulteress if she become another man's: but if her husband be dead, she is free from the law; so that she is not an adulteress, though she become another man's.

Matthew 5:32

but I say unto you, that whosoever shall put away his wife, except on account of whoredom, tempteth her to commit adultery; and if any man marry her that is divorced, he committeth adultery.

Mark 10:6-12

but from the beginning of the world, God created them male and female.

John 8:3-5

And the scribes and pharisees brought to Him a woman taken in adultery;

1 Timothy 5:11-14

But the younger widows refuse: for when they grow wanton against Christ, they will needs 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 say unto you, that whosoever shall put away his wife, except on account of whoredom, tempteth her to commit adultery; and if any man marry her that is divorced, he committeth adultery.
Mark 10:6
but from the beginning of the world, God created them male and female.
John 8:3
And the scribes and pharisees brought to Him a woman taken in adultery;

Though

1 Timothy 5:11
But the younger widows refuse: for when they grow wanton against Christ, they will needs marry:

General references

Mark 10:9
Therefore let not man separate what God hath joined together.