Leviticus 21:9

And the daughter of any priest. — This statute, according to the administrators of the Law during the second Temple, applies only to betrothed and married daughters. Hence the ancient Chaldee version renders it, “and if the betrothed daughter”

She shall be burnt with fire. — Whilst the married daughter of a layman who had gone astray was punished with death by strangling (see Leviticus 20:10; Deuteronomy 22:23), the daughter of a priest who had disgraced herself was to be punished with the severer death by burning. Though the doom of the guilty partner in the crime is not mentioned here, his sentence was death by strangulation.