The feast of Unleavened Bread is linked with the Passover
and so they are referenced together as being one and the same (Luke 22:1
cf. Exodus 12:14-17)
The unleavened bread is called the "bread of affliction"
and is associated with Israel's departure in haste from Egypt (Deuteronomy 16:3 cf. Exodus 12:30-34)
PropheticFulfillment
Messiah referred to His body as the "Bread of Life"
(John 6:32-35,47-51)
Leavened bread symbolizes "malice and wickedness"
(sin) and unleavened bread is associated with "sincerity and truth" (holiness) -
I Corinthians 5:8
On the cross as "leavened bread", Messiah physically
bore the sins of His people (I Peter 2:24 cf. Romans 8:3)
In the grave as "unleavened bread", Messiah
lay after having purged the sins of His people (Hebrews 1:3)
Messiah's body lay in the earth for "three days and
three nights" as Jonah's body was in the whale "three days and three nights" (Matthew 12:38-40)
Messiah's body was NOT to see "corruption" (Acts 2:31 cf. Psalms 16:10)
and so could NOT be in the ground for more than three days, because corruption starts to set in on the fourth day
as indicated in the case of Lazarus (John 11:17,39)
SpiritualApplication
Messiah warned His disciples concerning the "leaven"
of "false doctrine" (Matthew 16:6-12)
The Pharisees ADDED TO the Word of God and made it of
"none effect" (Matthew 15:1-9)
The Sadducees SUBTRACTED FROM the Word of God and so denied
the "power of God" (Matthew 22:23-32)
The "leaven" of "false doctrine" (I Corinthians 5:8)
caused the "unspeakable fornication" and "bad glorying" at Corinth (I Corinthians 5:1-2,6),
which taught that the deeper the sin then the greater the grace of God (Romans 5:20 - 6:1) - a denial of the baptism which identifies the believer with Christ
in His death to sin and in His resurrection unto "newness of life" (Romans 6:2-5)