2 Samuel 24 David's Sinful Census

According to Mosaic Law (Exodus 30:11-16), when a census was taken, each counted person 20 years and older was to give a half shekel to make atonement for his life. The shekels collected were given as an offering to the LORD. But David's census was taken for his own personal gain. As commenter Mike Aquilina suggests; showing a shift in his foreign policy from diplomacy to military force.