God did not qualify His prohibition to not contact the departed by saying that the Israelites were permitted to contact the spirits 'of their own dead',... or the spirits of the godly prophets..... Contacting the dead is wrong...and He was very clear about that.
"...should not a people inquire of their God? Why consult the dead on behalf of the living?" Issaiah 8:19
Further...The dead can not be consulted, but a demon can,...and they love to immitate the departed.
A Christian who is seeking anyone but Jesus to intercede.." will be defiled by them...... I am the LORD your God." Leviticus 19
n Deuteronomy 18:10-12,....... God advises the Israelites to reject the practices of the people living around them....... Using His strongest language yet He says:...... "Let no one be found among you.... WHO CONSULTS THE DEAD.... Anyone who does these things is detestable to the LORD.
The word "necromancer" describes those who seek the departed...be it an individual or one who is seeking on they're own .... "Hebrew definition.... 'a seeker of the dead.' This is much the same as 'one who conjures up spirits.'
Necromancy:..... the conjuring up or contacting the dead. One who investigates, looks into, and seeks information from the dead.
Lev 20:6 God sys.........“‘The person who turns to the spirits of the dead and familiar spirits to 'commit prostitution by going after them', I will set my face against that person and cut him off from the midst of his people.
There is no possible misunderstanding or misinterpretation.... the Bible unequivocally condemns the practice of contacting the dead.