Leviticus 19:31

19:31 Do not turn to the spirits of the dead and do not seek familiar spirits to become unclean by them. I am the Lord your God.

Leviticus 21:11

21:11 He must not go where there is any dead person; he must not defile himself even for his father and his mother.

sn The prohibition here concerns those who would seek special knowledge through the spirits of the dead, whether the dead in general or dead relatives in particular (i.e., familiar spirits; see J. E. Hartley, Leviticus [WBC], 321, and B. A. Levine, Leviticus [JPSTC], 134). Cf. Lev 20:6 below.

tc Although the MT has “persons” (plural), the LXX and Syriac have the singular “person” corresponding to the singular adjectival participle “dead” (cf. also Num 6:6).