'Untrue' in the Bible

You who say that a man may not be untrue to his wife, are you true to yours? you who are a hater of images, do you do wrong to the house of God?

In no way: but let God be true, though every man is seen to be untrue; as it is said in the Writings, That your words may be seen to be true, and you may be seen to be right when you are judged.

But if, because I am untrue, God being seen to be true gets more glory, why am I to be judged as a sinner?

So if, while the husband is living, she is joined to another man, she will get the name of one who is untrue to her husband: but if the husband is dead, she is free from the law, so that she is not untrue, even if she takes another man.

And this, Do not be untrue in married life, Do not put to death, Do not take what is another's, Do not have desire for what is another's, and if there is any other order, it is covered by this word, Have love for your neighbour as for yourself.