In the beginning, God told the Jews what not to eat: the camel, the coney, the rabbit and the pig; the eagle, the vulture and “all creatures in the seas … that do not have fins and scales” (Lev. 11). Most famously, God said: “Do not cook a young goat in its mother’s milk” (Deut. 14:21). From these and other verses, the rabbis developed the rules of kashrut (keeping kosher) that millions of Jews observe today.