a knowing one: a ghost consulted because it is thought to know hidden things, or the person who hosts it and speaks for it
All eleven appearances of this word sit in one setting: someone is trying to get information out of the dead. The name is built from the everyday Hebrew verb for knowing (ידע), and its shape marks out someone, or something, defined by knowledge. Whatever else it is, it is a knower, a source of secrets that ordinary life does not hand over.
What it will not do is hold still. One law speaks of a man or woman with one of these inside them, which sounds like a spirit lodged in a host. A narrative has a king clearing them out of the country, which only works if they are people. Another has a king gathering them up and burning them, which only works if they are things. Scholars have argued for a long time over which is the real meaning, and the strongest recent answer is that the question is put wrongly: in the ritual itself the medium and the ghost were felt to merge, and the word merged with them.
It never travels alone. In all eleven verses it is chained to a partner word for the ghost, or for the one who calls it up (אוֹב), and the two work rather like the English phrase "witchcraft and sorcery": a matched pair used to fence off one forbidden area rather than to name two tidy professions. That is why a biblical writer can attach the word to a spirit, to a person, or to a thing without any sense of having changed the subject.
Nuances
Whether Leviticus 20:27 condemns a person for hosting a spirit or simply labels that person a practitioner.
- contestedThe phrase "in whom there is" treats the word as a spirit residing in the person, who is stoned for hosting it.; Baruch A. Levine, Leviticus, JPS Torah Commentary (Philadelphia: JPS, 1989), 138-139; Brian B. Schmidt, Israel's Beneficent Dead, FAT 11 (Tübingen: Mohr Siebeck, 1994), 152-154
- contestedThe wording is granted, but the practical target of the law is the human practitioner, executed for the trade.; Jacob Milgrom, Leviticus 17-22, Anchor Bible 3A (New York: Doubleday, 2000), 1765-1768
Disputed
Whether the fixed pairing with its companion term is one expression covering necromancy as a whole, or names two distinct things.
- contestedA fixed word pair covering the whole domain of consulting the dead, given that this word never once occurs without its partner.; David T. Tsumura, The First Book of Samuel, NICOT (Grand Rapids: Eerdmans, 2007), 619; Bill T. Arnold, "Necromancy and Cleromancy in 1 and 2 Samuel," CBQ 66/2 (2004): 199-213
- contestedTwo distinct offenses or entities: the laws join the two terms and then take each up separately, and the priestly material is addressing two different underworld practices.; Jacob Milgrom, Leviticus 17-22, Anchor Bible 3A (New York: Doubleday, 2000), 1701; Thomas Hieke, Levitikus 16-27, HThKAT (Freiburg: Herder, 2014), 787