Answer: Passover commemorates the Biblical story of Exodus — where God freed the Israelites from slavery in Egypt. The celebration of Passover is prescribed in the book of Exodus in the Old Testament. On Passover, we celebrate how God took the Jewish People (Israelites) out of Egypt, where they had been enslaved by Pharaoh. With Moses as His representative, G‑d brought 10 plagues upon the Egyptians until they agreed to send the Jews from their land.Jacob and his children had arrived in Egypt to be close Joseph; he was second in command to King Pharaoh, and with his ingenuity had saved the people of Egypt, and by extension those from neighboring countries, from death by famine. Jacob and his children were settled in the city of Goshen and prospered wonderfully—their numbers grew and grew.