New Revised Standard Version
So Saul died for his unfaithfulness; he was unfaithful to the LORD in that he did not keep the command of the LORD; moreover, he had consulted a medium, seeking guidance,

Contemporary English Version
Saul died because he was unfaithful and disobeyed the LORD. He even asked advice from a woman who talked to spirits of the dead,

New American Bible
Thus Saul died because of his treason against the LORD in disobeying his word, and also because he had sought counsel from a ghost,

Douay-Rheims Bible
So Saul died for his iniquities, because he transgressed the commandment of the Lord, which he had commanded, and kept it not: and moreover consulted also a witch,

So Saul died for his iniquities, because he transgressed the commandment of the Lord, which he had commanded, and kept it not: and moreover consulted also a witch,

committed [heb] transgressed

1 Samuel 13:13 And Samuel said to Saul: Thou hast done foolishly, and hast not kept the commandments of the Lord thy God, which he commanded thee. And if thou hadst not done thus, the Lord would now have established thy kingdom over Israel for ever:

1 Samuel 15:2,23 Thus saith the Lord of hosts: I have reckoned up all that Amalec hath done to Israel: how he opposed them in the way when they came up out of Egypt. . . .

for asking

1 Samuel 28:7-20 And Saul said to his servants: Seek me a woman that hath a divining spirit, and I will go to her, and enquire by her. And his servants said to him: There is a woman that hath a divining spirit at Endor. . . .

a familiar

Exodus 22:18 Wizards thou shalt not suffer to live.

Leviticus 19:31 Go not aside after wizards: neither ask any thing of soothsayers, to be defiled by them. I am the Lord your God.

Leviticus 20:6 The soul that shall go aside after magicians, and soothsayers, and shall commit fornication with them: I will set my face against that soul, and destroy it out of the midst of its people.

Deuteronomy 18:10-14 Neither let there be found among you any one that shall expiate his son or daughter, making them to pass through the fire: or that consulteth soothsayers, or observeth dreams and omens, neither let there be any wizard, . . .

2 Kings 21:6 And he made his son pass through fire: and he used divinations, and observed omens, and appointed pythons, and multiplied soothsayers, to do evil before the Lord, and to provoke him.

Isaiah 8:19 And when they shall say to you: Seek of pythons, and of diviners, who mutter in their enchantments: should not the people seek of their God, for the living of the dead?

Acts 8:9-11 There was therefore great joy in that city. Now there was a certain man named Simon who before had been a magician in that city, seducing the people of Samaria, giving out that he was some great one: . . .

Acts 16:16-18 And it came to pass, as we went to prayer, a certain girl having a pythonical spirit met us, who brought to her masters much gain by divining. . . .