We complete chapter 13 with a review of Saul's disobedience and its cost -- the kingdom was taken away from him and given to another. It also caused the oppression of the Israelites. Sin while it may provide momentary pleasure can also have long reaching consequences.
As Samuel's time as a judge over Israel nears an end, the people cry out for a king to rule over them as other nations have kings. The Lord assures Samuel that it is not a rejection of him, rather it is a rejection of God. Samuel explains to the people the true cost of a king and they cry out still for a king.