'Untrue' in the Bible

The Pharisee, taking up his position, said to himself these words: God, I give you praise because I am not like other men, who take more than their right, who are evil-doers, who are untrue to their wives, or even like this tax-farmer.

You have knowledge of what the law says: Do not be untrue to your wife, Do not put anyone to death, Do not take what is not yours, Do not give false witness, Give honour to your father and mother.