The LORD has done to you as he spoke by me, for the LORD has torn the kingdom out of your hand and given it to your neighbor, David.
We have here the conference between Saul and Satan. Saul came in disguise (Sa1 28:8), but Satan soon discovered him, Sa1 28:12. Satan comes in disguise, in the disguise of Samuel's mantle, and Saul cannot discover him. Such is the disadvantage we labour under, in wrestling with the rulers of the darkness of this world, that they know us, while we are ignorant of their wiles and devices. I.
Commenting on 1 Samuel 28:15-19
And the Lord hath done to him,.... To David, Saul's enemy, as he insinuated he was: as he spake by me; pretending to be the true Samuel, and wearing the guise of him, he speaks his very words, which he was well acquainted with, and could deliver exactly as he did: for the Lord hath rent the kingdom out of thine hand, and given it...
SAUL SEEKS A WITCH, WHO, BEING ENCOURAGED BY HIM, RAISES UP SAMUEL. (1Sa. 28:7-25) 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.
Commenting on 1 Samuel 28:7-25