Leviticus, a priestly book, has as its primary focus an emphasis on the cleanliness of the community and its adherence to ritual matters for the sake of God’s blessings. … In the portion called, Emor, a significant redundancy occurs in the Hebrew text. We read that God said to Moses: Emor el hakohanim b’nei Aharon, ve-amarta aleihem… “Speak to the priests, the sons of Aaron, and you shall say to them…” (Leviticus 21:1).
In Parashat Emor, the Torah reports that a man born of mixed Israelite-Egyptian descent “blasphemed the Name [of God],” was placed on trial, and was stoned to death. A law was then enacted that anyone, Jewish or gentile, who blasphemes the name of God shall be put to death. Over time, in communities throughout the world, laws against blasphemy were put in place to address curses leveled at God as well as perceived slights against some religions.