Halakhah su Deuteronomio 18:11

It is customary to go to the cemetery erev Rosh Hashanah after the Shacharis prayers and bow prayerfully at the graves of tzaddikim [righteous men]. Charity should be given to the poor, and many fervent supplications offered to arouse the saintly tzaddikim, in their eternal resting place to intercede for us on the Day of Judgement. An additional reason for going to the cemetery is that the place where tzaddikim are buried is sacred and pure, and prayers are more readily accepted when they are offered on sacred ground, and the Holy One, blessed is He, will show us kindness for the sake of the tzaddikim. But it should not be your intention to appeal to the dead who rest there, for that would be tantamount to "Inquiring of the dead," (Deuteronomy 18:11), which is forbidden, but you should ask of Hashem, blessed is His name, to have mercy on you for the sake of the tzaddikim who rest in the dust. When you arrive at the cemetery, if you have not seen graves within the past thirty days, you must say the berachah: Asher yatzar eschem badin [Who has formed you in judgement etc.] (see Chapter 60:11. above) When you approach the grave, you should say, "May it be Your will, that the repose of [so-and-so] who is buried here, be in peace, and may his merit aid me." When placing your hand on the grave, the left hand only should be placed, —not the right hand. You should recite the verse, "Hashem will always guide you, and satisfy your soul with splendor, and make your bones strong, you will be like a watered garden and like a spring of water whose water will not fail." (Isaiah 58:11) "May you lie in peace, and may you sleep in peace until Menachem (the Comforter, Moshiach) comes, announcing peace." (When placing your hand [on the grave] you should have in mind the verse, "Hashem will always guide you," which contains fifteen words the same as the number of joints in the hands.) You should not visit the same grave twice on the same day. Reading the inscription on a headstone, if it is protruding, causes forgetfulness. A remedy for that is to say the prayer Ahavah rabbah (With abundant love) up to uleyachedcha be'ahavah [and to proclaim Your Oneness with love].

"A spell-caster" (Deuteronomy 18:11) is someone who gathers animals or snakes or scorpions or mosquitoes or flies with whispers.

"A necromancer" (Deuteronomy 18:11) is someone who starves themselves and sleeps in the cemetery in order to have unholy spirits rest upon them.