The fourth aliyah contains several commandments that distinguish the Jewish nation from the other nations. As chosen people we are not allowed to mutilate our bodies for the dead as some nations are accustomed to do. Furthermore, we eat only animals with a wholly cloven hoof, and that chew their cud. Fish must have fins and scales. Birds that we may not eat are listed here. Meat must be properly slaughtered. Meat must not be cooked with milk.