1 Samuel 28:1-3

About that time the Philistines mustered their armies for another war with Israel. King Achish told David, “You and your men will be expected to join me in battle.” “Very well!” David agreed. “Now you will see for yourself what we can do.” Then Achish told David, “I will make you my personal bodyguard for life.” Meanwhile, Samuel had died, and all Israel had mourned for him. He was buried in Ramah, his hometown. And Saul had banned from the land of Israel all mediums and those who consult the spirits of the dead.