1 Samuel 15-16
Saul disobeys the Lord and so God rejects him as King of Israel. This leads to the anointing of David as the next king. It's from this passage that our theme verse is drawn "People look at the outward appearance, but the Lord looks at the heart" (1 Samuel 16:7). From these two chapters we begin to see the contrast between Saul and David and what God desires from those who will lead his people.