Leviticus 24:15-16

And thou shalt speak unto the children of Israel, saying, Whosoever curseth his God shall bear his sin. And he that blasphemeth the name of Jehovah, he shall surely be put to death; all the congregation shall certainly stone him: as well the sojourner, as the home-born, when he blasphemeth the name of Jehovah, shall be put to death.