Leviticus 20:9

“For everyone that curseth his father or his mother, etc.] Here begins the account of the penalties annexed to the several laws in the preceding chapter; and that respecting the fear and honour of parents being the first, (<031903>Leviticus 19:3), is here begun with: shall surely be put to death; the Targum of Jonathan adds, “by casting of stones,” stoning being the punishment of such transgressors: he hath cursed his father or his mother: to do either is his sin, and a capital crime it is: his blood [shall be] upon him: he shall be guilty of death, be condemned unto it, and punished with it, namely, by stoning; for, as Jarchi observes, wherever it is, “his blood [shall be] on him”, or “their…”

“Curseth - This is not here meant of every perverse expression, but of bitter reproaches or imprecations. His blood shall be upon him - He is guilty of his own death: he deserves to die for so unnatural a crime. Leviticus 20:12”

“20:9-27 Because pagan worship affected ethics, the regulations for families follow immediately after those dealing with pagan religious practices. To some extent, the laws of this section replicate those of 18:6-30, which precede the section dealing with proper expressions of holiness (19:1-37). These were all related issues, as the proper worship of God led to proper conduct toward other people, while improper worship of God led to moral violations. 20:9 The Hebrew word for dishonors means “to make light of, treat with contempt,” and is traditionally translated “curse,” in the sense of calling someone a vulgar or profane name. Parental authority was given by God, not chosen by the child…”

“curseth: The term yekallel signifies not only to curse, but to speak contemptuously, disrespectfully, or to make light of a person, so that all speeches which have a tendency to lessen our parents in the eyes of others, or to render their judgment, piety, etc., suspected or contemptible, is here included; though the act of cursing, or of treating the parent with injurious or opprobrious language, is what is particularly intended. He who conscientiously keeps the fifth commandment, can be in no danger of the judgment here denounced. Exo 21:17; Deu 27:16; Pro 20:20, Pro 30:11, Pro 30:17; Mat 15:4; Mar 7:10 his blood: Lev 20:11-13, Lev 20:16, Lev 20:27; Jos 2:19; Jdg 9:24; Sa2 1:16; Kg1 2:32;…”

“Whoever cursed father or mother was to be punished with death ( Lev 19:3); "His blood would be upon him." The cursing of parents was a capital crime (see at Lev 17:4, and for the plural דּמיו Exo 22:1 and Gen 4:10), which was to return upon the doer of it, according to Gen 9:6. The same punishment was to be inflicted upon adultery ( Lev 20:10, cf. Lev 18:20), carnal intercourse with a father's wife ( Lev 20:11, cf. Lev 18:7-8) or with a daughter-in-law ( Lev 20:12, cf. Lev 18:17), sodomy ( Lev 20:13, cf. Lev 18:22), sexual intercourse with a mother and her daughter, in which case the punishment was to be heightened by the burning of the criminals when put to death ( Lev 20:14, cf. Lev…”