1 Samuel 28:3-7

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. The Philistines set up their camp at Shunem, and Saul gathered all the army of Israel and camped at Gilboa. When Saul saw the vast Philistine army, he became frantic with fear. He asked the LORD what he should do, but the LORD refused to answer him, either by dreams or by sacred lots or by the prophets. Saul then said to his advisers, “Find a woman who is a medium, so I can go and ask her what to do.” His advisers replied, “There is a medium at Endor.”