1 Samuel 16:14
14-18. The Spirit of the Lord departed from Saul, and an evil spirit from the Lord troubled him—His own gloomy reflections, the consciousness that he had not acted up to the character of an Israelitish king, the loss of his throne, and the extinction of his royal house, made him jealous, irritable, vindictive, and subject to fits of morbid melancholy.
1 Samuel 28:6-7
7, 8. Then said Saul unto his servants, Seek me a woman that hath a familiar spirit—From the energetic measures which he himself had taken for extirpating the dealers in magical arts (the profession having been declared a capital offense), his most attached courtiers might have had reason to doubt the possibility of gratifying their master's wish. Anxious inquiries, however, led to the discovery of a woman living very secluded in the neighborhood, who had the credit of possessing the forbidden powers. To her house he repaired by night in disguise, accompanied by two faithful servants.
En-dor—"the fountain of the circle" (that figure being constantly affected by magicians) was situated directly on the other side of the Gilboa range, opposite Tabor; so that, in this midnight adventure, Saul had to pass over the shoulder of the ridge on which the Philistines were encamped.