John Gill Commentary Leviticus 20:27

"A man also or a woman that hath a familiar spirit, or that is a wizard, shall surely be put to death: they shall stone them with stones; their blood shall be upon them." — Leviticus 20:27 (ASV)

A man also or a woman that has a familiar spirit
Or the spirit of Python or divination, see (Leviticus 19:31); such as the damsel had in (Acts 16:16); a woman is here particularly mentioned, though before included in the above law; because, as Aben Ezra says, such sort of practices were more frequently committed by women; to which Maimonides adds another reason, because men have a natural clemency towards the female sex, and are not easily prevailed upon to put them to death; therefore the law says, "you shall not suffer a witch to live", (Exodus 22:18);

or that is a wizard ;
a knowing one, who pretends to a great deal of knowledge of things; as of lost or stolen goods, and even knowledge of things future, and imposes upon persons, and cheats them of their money they give for information: such shall surely be put to death :
and not spared through favour and affection:

the death they are to be put to follows: they shall stone them with stones ;
until they are dead; of the manner of stoning, (See Gill on Acts 7:58);

their blood [shall be] upon them :
they are worthy of death, and they shall suffer it: this phrase following upon the former, the Jews ^F13 gather from hence, that, wherever it is used, it is to be understood of stoning; (See Gill on Leviticus 20:9).

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FOOTNOTES:

• F13: Torat Cohanim in Yalcut in loc.