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. ~ 1 Corinthians 5:7-8
Some have attempted to use this text as if Paul is commanding the Gentiles to keep the Jewish feast of Passover, but if we read this in context we can see that Paul refers to the feast as a metaphor. The context deals with sin that was in the midst of the Corinthian church, namely fornication.
Notice that they (the Corinthians) were to be unleavened. Unleavened was never once applied to the people under the Old Covenant. It was always the bread and cakes which were to be consumed as a holy ceremonial observance unto the Lord that were unleavened. The Israelites were to put away leaven for seven days and to eat unleavened bread only. This was a type of the putting away of sin in exchange for purity.
The Unleavened bread has its fulfillment in Christ, by whom our sins are put away. The context of Paul’s words to the Corinthians has specifically to do with putting away the fornication that the Corinthians had allowed to go unchecked in their midst.
Under the law, the feast of Passover was to be kept by the Israelites on the 14th day of the month of Nisan which was the first month on the Jewish calendar, (see Ex 12:6,14,18,19; Numbers 9:2; 28:16; Deuteronomy 16:1; Joshua 5:10; Ezekiel 45:21).
Leviticus 23:5 says, In the fourteenth day of the first month at even is the LORD’S Passover. In Corinthians, Paul does not make reference to this day as the Passover. Paul does not refer to Passover as a time on the calendar, or a ceremonial festival when speaking to the Corinthians. On the contrary, Paul refers to Christ Jesus himself as our Passover.
All that was commanded by God regarding the feasts under the Old Testament were types and shadows pointing to Christ, and Paul applies the object lesson which was contained in the shadowy type of the Passover given to Israel and tells the Corinthians to walk in the reality of it.
In other words, Paul says, Put away this sin from your midst and serve God in Christ with sincerity and truth because Christ, who is our Passover, was sacrificed for you. Again, notice that Paul tells them to do this so that they would be a new lump and they would be as unleavened bread.
There is nothing wrong with dedicating the Passover season as a time for the Lord to focus on Christ’s death for us. In fact that is a very good practice. The error comes in when the festival commanded under the law becomes a law for Christians to observe. This is becoming more of a common place within some of the modern day Messianic movements, such as the Hebrew Roots Movement.
The New Testament writers are the authoritative interpreters of the Old Testament scriptures and they gave us everything we need to know for godly and righteous living in Christ.
That which was foreshadowed in the feasts has become reality in Christ Jesus, and we can walk in the reality every day because the light has come and the shadow has been put away.
Therefore let no one judge you in regard to food and drink or in regard to [the observance of] a festival or a new moon or a Sabbath day. Such things are only a shadow of what is to come and they have only symbolic value; but the substance [the reality of what is foreshadowed] belongs to Christ.~ Colossians 2:16-17 Amplified Bible
If you would like to study more about the cross you can do so by following this link:
https://rootedandgroundedinchrist.com/the-cross/?frame-nonce=18a5dd8a0c
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THE BLOOD OF THE PASSOVER LAMB
https://michaelbattle65.wordpress.com/2018/03/18/the-blood-of-the-passover-lamb/
THE BIBLICAL DOCTRINE OF PASSOVER IN CONTRAST TO HEBREW ROOTS TEACHINGS