This feast day is a memorial not only for the children of Israel escaping the death malak (angel) passing over in Egypt, it is for us today symbolic of MESSIYAH YAHSHUA our Passover sacrifice.
Strong's Concordance Greek #3957 pascha {pas'-khah} pavsca of Aramaic origin [compare 6453]; AV -- Passover (28)
prop, a passing over 1) the paschal sacrifice (which was accustomed to be offered for YAHWEH's people's deliverance of old from Egypt) 2) the paschal lamb, i.e. the lamb the Israelites were accustomed to slay and eat on the fourteenth day of the month of Nissan (the first month of their year) in memory of the day on which their fathers, preparing to depart from Egypt, were bidden by YAHWEH to slay and eat a lamb, and to sprinkle their door posts with its blood, that the destroying angel, seeing the blood, might pass over their dwellings; MESSIYAH offered is likened to the slain paschal lamb 3) the paschal supper: to celebrate the paschal meal
4) the paschal festival, the feast of Passover, extending from the fourteenth to the twentieth day of the month Nisan