The Feast of the Passover was a celebration held by the ancient Hebrews to commemorate that the angel of destruction had passed by their homes when the first-born children in Egypt were killed. The Feast of the Passover also celebrates the redemption of the children of Israel from Egypt.
The book of Leviticus in the Old Testament describes the Passover:
“In the fourteenth day of the first month at even is the Lord’s passover. And on the fifteenth day of the same month is the feast of unleavened bread unto the Lord: seven days ye must eat unleavened bread. In the first day ye shall have an holy convocation: ye shall do no servile work therein. But ye shall offer an offering made by fire unto the Lord seven days: in the seventh day is an holy convocation: ye shall do no servile work therein.” (See Leviticus 23:5-8)
Passover is celebrated in springtime to celebrate a newness of life, the beginning of a new period of growth.
The feast of the Passover continued until the time of Christ. After the death of Christ, the Passover became a time for spiritual reflection, as described by Paul: “Purge out therefore the old leaven, that ye may be a new lump, as ye are unleavened. For even Christ our passover is sacrificed for us: Therefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness; but with the unleavened bread of sincerity and truth.” (See 1 Corinthians 5:7)
Jesus Christ is sometimes referred to as “Our Passover,” since his atoning sacrifice prevents death from having a permanent hold on us. In the Book of Mormon, Amulek describes this sacrifice: ““For it is expedient that there should be a great and last sacrifice; yea, not a sacrifice of man, neither of beast, neither of any manner of fowl; for it shall not be a human sacrifice; but it must be an infinite and eternal sacrifice.” (See Alma 34:10)