​The feast of the Lord's Passover and days of unleavened bread were taught to the Church by Prophet William S. Crowdy, to observe this time according the Bible.

 

See Exodus 12, Leviticus 23:4-8, Numbers 28:16-18,25, Deuteronomy 16:1-8, 

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During the week long Feast, unleavened bread (matzah) should be eaten.​ Aside from eating matzah, there are other special dietary restrictions that should be observed during the Passover week. Most restrictions evolve around the eating of leavened foods. Leavened food is even prohibited from being in the home during Passover.

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These days are memorials and holy convocations for the entire Church.