1 Chronicles 10:13

And Saul died for his unfaithfulness which he committed against Jehovah, because of the word of Jehovah which he kept not, and also for having inquired of the spirit of Python, asking counsel of it;

Leviticus 19:31

Turn not unto necromancers and unto soothsayers; seek not after them to make yourselves unclean: I am Jehovah your God.

Leviticus 20:6

And the soul that turneth unto necromancers And unto soothsayers, to go a whoring after them, I will set my face against that soul, And will cut him off from among his people.

1 Samuel 15:23

For rebellion is as the sin of divination, And selfwill is as iniquity and idolatry. Because thou hast rejected the word of Jehovah, He hath also rejected thee from being king.

Deuteronomy 18:10-14

There shall not be found among you he that maketh his son or his daughter to pass through the fire, that useth divination, that useth auguries, or an enchanter, or a sorcerer,

Isaiah 8:19

And when they shall say unto you, Seek unto the necromancers and unto the soothsayers, who chirp and who mutter, say, Shall not a people seek unto their God? Will they go for the living unto the dead?

Exodus 22:18

thou shalt not suffer a witch to live.

1 Samuel 13:13-14

And Samuel said to Saul, Thou hast done foolishly: thou hast not kept the commandment of Jehovah thy God which he commanded thee; for now would Jehovah have established thy kingdom over Israel for ever.

1 Samuel 15:2

Thus saith Jehovah of hosts: I have considered what Amalek did to Israel, how he set himself against him in the way, when he came up from Egypt.

1 Samuel 28:7-20

Then said Saul to his servants, Seek me a woman that has a spirit of Python, that I may go to her and inquire of her. And his servants said to him, Behold, there is a woman who has a spirit of Python at En-dor.

2 Kings 21:6

And he caused his son to pass through the fire, and used magic and divination, and appointed necromancers and soothsayers: he wrought evil beyond measure in the sight of Jehovah, to provoke him to anger.

Acts 8:9-11

But a certain man, by name Simon, had been before in the city, using magic arts, and astonishing the nation of Samaria, saying that himself was some great one.

Acts 16:16-18

And it came to pass as we were going to prayer that a certain female slave, having a spirit of Python, met us, who brought much profit to her masters by prophesying.

Treasury of Scripture Knowledge

Summary

So Saul died for his transgression which he committed against the LORD, even against the word of the LORD, which he kept not, and also for asking counsel of one that had a familiar spirit, to inquire of it;

For asking

General references

Bible References

Even against

1 Samuel 13:13
And Samuel said to Saul, Thou hast done foolishly: thou hast not kept the commandment of Jehovah thy God which he commanded thee; for now would Jehovah have established thy kingdom over Israel for ever.
1 Samuel 15:2
Thus saith Jehovah of hosts: I have considered what Amalek did to Israel, how he set himself against him in the way, when he came up from Egypt.

For asking

1 Samuel 28:7
Then said Saul to his servants, Seek me a woman that has a spirit of Python, that I may go to her and inquire of her. And his servants said to him, Behold, there is a woman who has a spirit of Python at En-dor.

A familiar

Exodus 22:18
thou shalt not suffer a witch to live.
Leviticus 19:31
Turn not unto necromancers and unto soothsayers; seek not after them to make yourselves unclean: I am Jehovah your God.
Leviticus 20:6
And the soul that turneth unto necromancers And unto soothsayers, to go a whoring after them, I will set my face against that soul, And will cut him off from among his people.
Deuteronomy 18:10
There shall not be found among you he that maketh his son or his daughter to pass through the fire, that useth divination, that useth auguries, or an enchanter, or a sorcerer,
2 Kings 21:6
And he caused his son to pass through the fire, and used magic and divination, and appointed necromancers and soothsayers: he wrought evil beyond measure in the sight of Jehovah, to provoke him to anger.
Isaiah 8:19
And when they shall say unto you, Seek unto the necromancers and unto the soothsayers, who chirp and who mutter, say, Shall not a people seek unto their God? Will they go for the living unto the dead?
Acts 8:9
But a certain man, by name Simon, had been before in the city, using magic arts, and astonishing the nation of Samaria, saying that himself was some great one.
Acts 16:16
And it came to pass as we were going to prayer that a certain female slave, having a spirit of Python, met us, who brought much profit to her masters by prophesying.

General references

Leviticus 19:31
Turn not unto necromancers and unto soothsayers; seek not after them to make yourselves unclean: I am Jehovah your God.