1 Samuel 28-31 Saul's Death

Before his final battle with the Philistines, Saul had lost all contact with God. In desperation, he consulted a necromancer who channeled the ghost of Samuel who predicted Saul's defeat and death. David meanwhile was rejected when he tried to join the Philistine army fighting against Israel. This was quite providential because he would have had a very difficult time uniting Israel under his reign had he sided with their enemies.