Leviticus 24:14-16

14“Take the blasphemer outside the camp. All those who heard him are to lay their hands on his head, and the entire assembly is to stone him. 15Say to the Israelites: ‘Anyone who curses their God will be held responsible; 16anyone who blasphemes the name of the Lord is to be put to death. The entire assembly must stone them. Whether foreigner or native-born, when they blaspheme the Name they are to be put to death.