So Saul instructed his servants, “Find me a woman who is a medium, ¹  so that I may go to her and inquire of her.” His servants replied to him, “There is a woman who is a medium in Endor.”

one who casts spells, ¹  one who conjures up spirits, ²  a practitioner of the occult, ³  or a necromancer. ⁴ 

“‘A man or woman who ¹  has in them a spirit of the dead or a familiar spirit ²  must be put to death. They must pelt them with stones; ³  their blood guilt is on themselves.’”

So Saul died because he was unfaithful to the Lord and did not obey the Lord’s instructions; he even tried to conjure up underworld spirits. ¹ 

You will fall; while lying on the ground ¹  you will speak; from the dust where you lie, your words will be heard. ²  Your voice will sound like a spirit speaking from the underworld; ³  from the dust you will chirp as if muttering an incantation. ⁴ 

Saul quickly fell full length on the ground and was very afraid because of Samuel’s words. He was completely drained of energy, ¹  not having eaten anything ²  all that day and night.