The Passover feast was established by God during the night when the death angel was to pass through the land of Egypt.
God told Moses in Exodus 12:42-48. (Read all of chapter 12), It is a night to be remembered.
The Lord said in Exodus 12:12 For I will pass through the land of Egypt this night, and will smite all the firstborn in the land of Egypt z, both man and beast; and against all the gods of Egypt I will execute judgment: I am the LORD.

The feast of Passover is the feast of the firstborn. Jesus Christ is the firstborn of the dead. Colossians 1:18 CHRIST is the head of the church which is His body. He is the beginning, the firstborn from the dead, that is in all things He might have the preeminence.

In Hebrew 12:22-24 But ye are come unto Mount Sion, and unto the city of the living God, the heavenly Jerusalem, and to an innumerable company of angels. To the general assembly and Church of the firstborn, which are written in heaven, and to God the judge of all, and to the spirits of just men made perfect.

The second Passover is for the children of Israel to receive Christ as a nation
Scriptures which shows Israel will have the second Passover feast
Isaiah 11:11
Hosea 6:1-3
Jeremiah 30:7 Time of Jacob trouble, he wove saved.
Ephraim who will go under the Rod of God during the first half of The tribulation seven years period .
Zechariah 9:9
Firstborn scriptures
Exodus 4:22
Hebrew 12:22-23
Psalms 89:27
Roman 8:29
Colossians 1:13-19