I Corinthians chapter 5
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6] Your glorying is not good. Know ye not that a little leaven leaveneth the whole lump?
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7] 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:
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8] 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.
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9] I wrote unto you in an epistle not to company with fornicators:
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10] Yet not altogether with the fornicators of this world, or with the covetous, or extortioners, or with idolaters; for then must ye needs go out of the world.
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11] But now I have written unto you not to keep company, if any man that is called a brother be a fornicator, or covetous, or an idolater, or a railer, or a drunkard, or an extortioner; with such an one no not to eat.
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12] For what have I to do to judge them also that are without? do not ye judge them that are within?
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13]
But them that are without God judgeth. Therefore put away from among yourselves that wicked person.
I'm assuming that you're referring to the part of that verse that I bold-faced or that you're saying that those outside of the church will be judged by God and not by us for their actions.
That's fine, but what about the preceding verses?
I mean, surely you can recognize that "Christ our PASSOVER is sacrificed for us" in that he became the fulfillment of the Passover lamb when he was crucified ON THE FEAST OF PASSOVER.
In other words, that was GOD'S ordained holy day/holiday which foreshadowed the same.
Similarly, Christ was raised from the dead on the Feast of Firstfruits, God's ordained holy day/holiday which foreshadowed the same, and, for this precise reason, Paul twice refers to Christ as "the firstfruits of them that slept" (I Cor. 15:20) or "the firstfruits" (I Cor. 15:23)
Why then should we forsake the actual dates that God has ordained in place of pagan holy days/holidays ordained of wicked men?