Every year in March or April, Jewish people around the world celebrate Passover — a holiday that marks the Exodus, when the Jews escaped slavery in Egypt and moved to Israel, as recounted in the Torah (the Hebrew Bible, which collects the first five books of the Christian Old Testament).
Before Moses could lead the 40-year journey through the desert, he needed the pharaoh's permission to free the Jews from enslavement, according to the Torah. Egypt’s ruler had a hard heart, however, prompting the Lord to send down 10 plagues until the pharaoh changed his mind.
