Zech. 14 tells us we will celebrate the feasts days along with the sacrifices, these will both be reinstituted in the millennium (Ez.44:1-46- 46:24)

Zech 14:16-18 “And it shall come to pass that everyone who is left of all the nations which came against Jerusalem shall go up from year to year to worship the King, the LORD of hosts, and to keep the Feast of Tabernacles. And it shall be that whichever of the families of the earth do not come up to Jerusalem to worship the King, the LORD of hosts, on them there will be no rain. If the family of Egypt will not come up and enter in, they shall have no rain; they shall receive the plague with which the LORD strikes the nations who do not come up to keep the Feast of Tabernacles.”

v.21 “Yes, every pot in Jerusalem and Judah shall be holiness to the LORD of hosts. Everyone who sacrifices shall come and take them and cook in them. In that day there shall no longer be a Canaanite in the house of the LORD of hosts.”

Isaiah also says, Isaiah 56:7 “Even them I will bring to My holy mountain, and make them joyful in My house of prayer. Their burnt offerings and their sacrifices will be accepted on My altar; for My house shall be called a house of prayer for all nations."

Isa 66:23 "And it shall come to pass that from one New Moon to another, and from one Sabbath to another, all flesh shall come to worship before Me," says the LORD. Isa. 66:23 teaches that we will keep the Sabbath, it also teaches we will keep the New Moon festival! This is on earth in the Millennium period- not in heaven."

If the Sabbath and feast days and the sacrifices are done away with in Christ how do we reconcile these two seemingly contradictory positions? How can there be a return to the sacrificial system without taking away from the meritorious sacrifice of Christ?

Millennial Israel will have at its center the Temple. Sacrifices (Ezek. 40:38-39), will continually be done during the Kingdom Age (Ezekiel 45:13 – 46:15).The millennial offerings are distinctly Jewish nature, of Jewish history and will be administered by Jews, their commemorative purpose will be embraced by Gentiles who will join in celebration of the millennial King who will be on earth. This is made clear in Zechariah 8 v.23, 'In those days it shall come to pass, that ten men shall take hold out of all languages of the nations, even shall take hold of the skirt of him who is a Jew, saying, We will go with you for we have heard that God is with you'.

It will some similarities to Mosaic system and some new features. So it should not be mistaken for a reinstitution of Mosaic law system, since Moses sacrificial system did not take away sin but Jesus' last sacrifice did.

The problem is easily solved if we view them as being COMMEMORATIVE rather than EFFICACIOUS.

The sacrifices will be a memorial, just as communion is practiced today looking back. They will not be propitiation, or effacacious (they will have no power to redeem) but are a reminder of what took place. The reason this will be instituted is because there will be many unbelievers born in the Millennial period, they will be sinners that will need to understand the sacrifice Christ did. Since his sacrifice is the final one, that cannot be repeated the types he fulfilled will be illustrative of his accomplishment. Just as the church is commanded to continue the Lord's Supper until he comes.

In Isa. 53 the Servant of Jehovah’s sacrifice puts an end to all animals sacrifices. Just as the Old Testament sacrifices pointed forward to Christ, and found their fulfillment in the supreme efficacious sacrifice of Christ, so the millennial sacrifices will look back in commemorative fulfillment in the same manner. In other words, the sacrifices will be symbols to the millennial population of the prior sacrifice of Christ. Just as the church is commanded to continue the Lord's Supper until He comes, they will continue in these because He has come. It will also give testimony of his faithfulness to the Jews for whom he first gave these commands to.

The new moon festivals, the feast of tabernacles, and the Sabbaths, were set times among the Hebrews (not Gentiles) for the worship of God; in the Millennium these will be used as the reminders for the assembly of worship as God will be celebrated in all nations. As all Israel assembled in Jerusalem for the three great feasts under the Old Testament law of Moses, representatives of the nations will journey to Jerusalem every new moon and every Sabbath. The new moon was observed with sacrifices. The Sabbath will be kept by the Gentiles which also includes sacrifices; The Mosaic Law forbid Gentile to enter in the Temple (Deut.231-8), but it will be permitted by the new Law instituted by Christ in the Millennium (Ezek.46:1-5).The Gentiles will show their commitment to the covenant by keeping the Sabbath and the Feast days, thus having fellowship with God.

So, far from being contradictory, the millennial sacrificial system will be instituted as a commemorative celebration of the completeness of the last and efficacious sacrifice of our Saviour, Jesus Christ our Lord and redeemer. The temple will truly become a house of prayer for all nations.