What does Exodus 12:18 mean?
God established a new beginning for the Hebrew calendar in connection with their liberation from Egypt (Exodus 12:1–2). The 14th evening of what was now the first month, Nisan, would be remembered as the Passover. This would commemorate the Lord's brutal judgment on Egypt (Exodus 11:4–6) and His gracious mercy on the faithful Israelites who trusted in a sacrificial lamb (Exodus 12:13). This would begin a festival of Unleavened Bread (Exodus 12:17). This is tied to the bread Israel ate on the night of the Passover (Exodus 12:8), which they also carried as food when suddenly released from slavery (Exodus 12:39).Altogether, the Passover and Feast of Unleavened Bread spanned the eight days Nisan 14—21, concluding on the evening of the twenty-first or the start of the twenty-second, with sunset marking the beginning of the new day in the Jewish reckoning. At least since New Testament times, Passover and Unleavened Bread are considered as one holiday. Luke 22:1 simply referred to both times as the Passover. Today, synagogue services are often held on the first and last days of the feast (Exodus 12:16).