Further themes in the Old Testament include salvation, redemption, divine judgment, obedience and disobedience, faith and faithfulness, among others. Throughout there is a strong emphasis on ethics and ritual purity, both of which God demands, although some of the prophets and wisdom writers seem to question this, arguing that God demands social justice above purity, and perhaps does not even care about purity at all. The Old Testament's moral code enjoins fairness, intervention on behalf of the vulnerable, and the duty of those in power to administer justice righteously. It forbids murder, bribery and corruption, deceitful trading, and many sexual misdemeanors. All morality is traced back to God, who is the source of all goodness.