That is HOW we uphold Passover.
Passover did not 'vanish away'. It gets upheld when we have faith in Christ. The Feast of Unleavened Bread gets upheld, not brushed away, when the household of God's people cast out the leaven of wickedness and walk in the Spirit instead:
"7 Get rid of the old yeast, so that you may be a new unleavened batch—as you really are. For Christ, our Passover lamb, has been sacrificed.8 Therefore let us keep the Festival (of Unleavened Bread that immediately follows Passover), not with the old bread leavened with malice and wickedness, but with the unleavened bread of sincerity and truth." (1 Corinthians 5:7-8 NIV)
This is how faith upholds the law of Moses. What 'vanished away' was the first covenant WAY of upholding the law of Moses for the Passover and the Feast of Unleavened Bread, and all the rest of the literal Festivals and Sabbaths commanded by God.
The observances didn't 'go away'. The old way of fulfilling them did.
4 But when the fullness of the time had come, God sent forth His Son, born of a woman, born under the law, 5 to redeem those who were under the law, that we might receive the adoption as sons. 6 And because you are sons, God has sent forth the Spirit of His Son into your hearts, crying out, "Abba, Father!" 7 Therefore you are no longer a slave but a son, and if a son, then an heir of God through Christ. 8 But then, indeed, when you did not know God, you served those which by nature are not gods. 9 But now after you have known God, or rather are known by God, how is it that you turn again to the weak and beggarly elements, to which you desire again to be in bondage? 10 You observe days and months and seasons and years. 11 I am afraid for you, lest I have labored for you in vain.Galatians 4:4-11
... to redeem those who were under the law,
how is it that you turn again to the weak and beggarly elements, to which you desire again to be in bondage? You observe days and months and seasons and years.
For these are the two covenants: the one from Mount Sinai which gives birth to bondage, which is Hagar-- 25 for this Hagar is Mount Sinai in Arabia, and corresponds to Jerusalem which now is, and is in bondage with her children-- Galatians 4:24-25
Argue with Paul!
Bondage!!!
JLB