Unclean
Unclean, unclean most of us consider ourselves unclean especially with regards to sin. In the First Reading, Moses and Aaron are concerned with leprosy being a state of uncleanness while in the Second Reading Paul condemns the attitude of a divides church for Jews or Gentiles.
Contriteness
King David is not a saint, in that he is far worst then King Saul. The only thing that classifies them apart, is their relationship with God. And when David is confronted with the choice of punishment, he rather be taken to task by God, then human beings.
Who is Your King?
What they had sowed they were now reaping (today’s first reading). With no King in their midst. They did not know their King-God also. Now they were in the midst of people who were different and they were afraid of them.