It is manifest both that the apparition of Samuel was real, and also that the woman was utterly unprepared for it.

Why hast thou deceived me ... - She perhaps inferred that Samuel would have answered the call of none inferior to the king. Or it may be the presence of an inhabitant of the world of spirits brought a sudden illumination to her mind.

When the woman saw Samuel - That Samuel did appear on this occasion, is most evident from the text; nor can this be denied from any legitimate mode of interpretation: and it is as evident that he was neither raised by the power of the devil nor the incantations of the witch, for the appearances which took place at this time were such as she was wholly unacquainted with. Her familiar did not appear; and from the confused description she gives, it is fully evident that she was both surprised and alarmed at what she saw, being so widely different from what she expected to see.

And when the woman saw Samuel,.... The appearance of him whom she took for Samuel; no mention is made of the methods she used to raise him, to check the curiosity of such as might be desirous to know them, and to prevent the imitation of them; though some think that Samuel, or the apparition, was seen before she made use of any, which surprised her; but this seems not so probable, and is only observed for the sake of an hypothesis; though it must be owned the word "when" is not in the text:

she cried with a loud voice; not so much frightened at what she saw, and the manner of his appearing, and as thinking the resurrection of the dead was come, as say the Jews (b), as what she feared would be the consequence to her, even death by the hand of Saul; for though he had sworn no punishment should come upon her, she might begin to fear she was not safe, perceiving who he was:

and the woman spake to Saul, saying, why hast thou deceived me? for thou art Saul: how she knew this is a question; it could not be by the appearance of Samuel, for it was Samuel she was to bring up; unless with Ben Gersom it can be thought that she understood him of another man, whose name was Samuel, and not Samuel the prophet; and so when she saw him, concluded he was Saul, because of the intimacy between them in his lifetime; but this is not probable, nor does it appear that she as yet knew who it was, but rather she was told by her familiar spirit, or by the apparition, so Josephus (c), that it was Saul that inquired of her; or she guessed at it by some gesture of the apparition to Saul, by way of homage and honour; and so Abarbinel thinks that the clause in 1 Samuel 28:14 respects not Saul's bowing to Samuel, but Samuel bowing to Saul; and so by this means the woman knew who he was.

(b) Pirke Eliezer, c. 33. (c) Antiqu. l. 6. c. 14. sect. 2.

The woman then commenced her conjuring arts. This must be supplied from the context, as 1 Samuel 28:12 merely states what immediately ensued. "When the woman saw Samuel, she cried aloud," sc., at the form which appeared to her so unexpectedly. These words imply most unquestionably that the woman saw an apparition which she did not anticipate, and therefore that she was not really able to conjure up departed spirits or persons who had died, but that she either merely pretended to do so, or if her witchcraft was not mere trickery and delusion, but had a certain demoniacal background, that the appearance of Samuel differed essentially from everything she had experienced and effected before, and therefore filled her with alarm and horror. The very fact, whoever, that she recognised Saul as soon as Samuel appeared, precludes us from declaring her art to have been nothing more than jugglery and deception; for she said to him, "Why hast thou cheated me, as thou art certainly Saul?" i.e., why hast thou deceived me as to thy person? why didst thou not tell me that thou wast king Saul? Her recognition of Saul when Samuel appeared may be easily explained, if we assume that the woman had fallen into a state of clairvoyance, in which she recognised persons who, like Saul in his disguise, were unknown to her by face.

And when the woman saw Samuel, she cried with a loud voice: and the woman spake to Saul, saying, Why hast thou deceived me? for thou art Saul.

28:12 Saw Samuel - The words are express, the woman saw Samuel, instead of the spirit whom she expected to see, God ordering it so for his own glory. She cried with a loud voice - Terrified and astonished, and thence easily conjectured, whom she had been talking with.

28:7-19 When we go from the plain path of duty, every thing draws us further aside, and increases our perplexity and temptation. Saul desires the woman to bring one from the dead, with whom he wished to speak; this was expressly forbidden, De 18:11. All real or pretended witchcraft or conjuration, is a malicious or an ignorant attempt to gain knowledge or help from some creature, when it cannot be had from the Lord in the path of duty. While Samuel was living, we never read of Saul's going to advise with him in any difficulties; it had been well for him if he had. But now he is dead, Bring me up Samuel. Many who despise and persecute God's saints and ministers when living, would be glad to have them again, when they are gone. The whole shows that it was no human fraud or trick. Though the woman could not cause Samuel's being sent, yet Saul's inquiry might be the occasion of it. The woman's surprise and terror proved that it was an unusual and unexpected appearance. Saul had despised Samuel's solemn warnings in his lifetime, yet now that he hoped, as in defiance of God, to obtain some counsel and encouragement from him, might not God permit the soul of his departed prophet to appear to Saul, to confirm his former sentence, and denounce his doom? The expression, Thou and thy sons shall be with me, means no more than that they shall be in the eternal world. There appears much solemnity in God's permitting the soul of a departed prophet to come as a witness from heaven, to confirm the word he had spoken on earth.