Romans 7:3

So then, if while her husband is living she connect herself with another man, she will be called an adulteress; but if her husband die, she is no longer bound by that law, so that she will not be an adulteress, though she connect herself with another man.

Matthew 5:32

But I say to you, that whoever putteth away his wife, unless it be on account of fornication, causeth her to commit adultery; and whoever shall marry her when put away, committeth adultery.

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 refuse; for when they become 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

Matthew 5:32
But I say to you, that whoever putteth away his wife, unless it be on account of fornication, causeth her to commit adultery; and whoever shall marry her when put away, committeth 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

1 Timothy 5:11
But younger widows refuse; for when they become wanton against Christ, they desire to marry;

General references

Mark 10:9
What therefore God joined together, let not man put asunder.