To answer this question, we need to describe the historical background briefly.
As we pointed out in the Q&A of Update #137, dated April 2, 2004, the Bible distinguishes between the Passover and the Days of Unleavened Bread. Both are annual Feast days, to be kept once a year. The Passover is to be observed at the beginning of the 14th day of the first month (which month is called Abib or Nisan), according to the Hebrew calendar (Leviticus 23:5; Numbers 28:16). The First Day of Unleavened Bread is to be observed at the beginning of the 15th day of the first month, according to the Hebrew calendar (Leviticus 23:6; Numbers 28:17). It was during the Passover night–the night of the 14th day–that the death angel passed over the Israelites who were in their houses (hence the name, “Passover,”), while killing the firstborn of Egypt (Exodus 12:6-13). But it was on the 15th day–“on the day AFTER the Passover”; that is, one entire day LATER–that the Israelites went out of Egypt, and it is on THAT day (at the beginning of the 15th day of the first month) that we are to celebrate the Night To Be Much Observed (Exodus 12:42; Numbers 33:3). (Remember that according to the Hebrew calendar, days start and end with sunset.)
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