1 Cor 5:7~8 ...for our Passover, Christ, also has been sacrificed. So then let us keep the feast, not with old leaven, neither with the leaven of malice and evil, but with the unleavened bread of sincerity and truth. 2 Cor 3:17 And the Lord is the Spirit; and where the Spirit of the Lord is, there is freedom.
In typology we have both the feast of Passover and the feast of Pentecost, called the feast of Weeks and also the feast of Harvest. The feast of Harvest typifies the enjoyment of Christ in His resurrection, whereas the Passover typifies Christ as the Lamb of God in His crucifixion. The Passover, therefore, refers to the crucifixion of Christ.
Christ's crucifixion has become a feast, called the feast of Passover. In this feast we enjoy Christ in His crucifixion as the redeeming Lamb. Three days after His crucifixion, Christ rose up from among the dead.
Fifty days later, the ascended Christ poured Himself out upon His believers as the all-inclusive Spirit, that is, as the ultimate consummation of the Triune God. That pouring out of the Spirit is the enjoyment of the harvest. In the Old Testament we have the Passover, the offering of a sheaf of the firstfruit of the harvest, and then the feast of Harvest, Pentecost.
On the Passover Christ was crucified for our redemption so that we might enjoy Him. On the day of Christ's resurrection there was the fulfillment of the type of the firstfruit of the harvest. Then fifty days later, on the day of Pentecost, there was the enjoyment of the harvest of the rich produce of the good land.
That was a type of Christ becoming the full enjoyment to His redeemed people as the life-giving Spirit poured out upon them from the heavens.