Plato wrote of a conversation between Socrates and a man named Euthyphro in which this question was raised: Does God command us to do things because they are good or are they good because God commands them? Many people feel that either answer creates a problem. If God commands us to do things because they are good that implies that there is a standard of goodness independent of God to which he must conform. If the things God commands are good because he commands them then good and evil exist only because of God’s arbitrary decision to call certain thing good and others evil. This problem is known as the Euthyphro dilemma.
While he was in one of the cities, there came a man full of leprosy. And when he saw Jesus, he fell on his face and begged him, “Lord, if you will, you can make me clean.” And Jesus stretched out his hand and touched him, saying, “I will; be clean.” And immediately the leprosy left him.
And he charged him to tell no one, but “go and show yourself to the priest, and make an offering for your cleansing, as Moses commanded, for a proof to them.”
Jesus told him to go to the priest because the Mosaic law required that an offering be made by anyone who had been cleansed from leprosy.