The Marriage Feast of the Lamb of God is also the New Covenant with the church. To understand this we must consider Gen 15:9-21.
9 He answered him, “Bring me a three-year-old heifer, a three-year-old she-goat, a three-year-old ram, a turtle-dove, and a young pigeon.” 10 He brought him all these, split them in two, and placed each half opposite the other; but the birds he did not cut up. 11 Birds of prey swooped down on the carcasses, but Abram stayed with them. 12 As the sun was about to set, a trance fell upon Abram, and a deep, terrifying darkness enveloped him. 13 Then the LORD said to Abram: “Know for certain that your descendants shall be aliens in a land not their own, where they shall be enslaved and oppressed for four hundred years. 14 But I will bring judgment on the nation they must serve, and in the end they will depart with great wealth. 15 You, however, shall join your forefathers in peace; you shall be buried at a contented old age. 16 In the fourth time-span the others shall come back here; the wickedness of the Amorites will not have reached its full measure until then.” 17 When the sun had set and it was dark, there appeared a smoking brazier and a flaming torch, which passed between those pieces. 18 It was on that occasion that the LORD made a covenant with Abram, saying: “To your descendants I give this land, from the Wadi of Egypt to the Great River (the Euphrates), 19 the land of the Kenites, the Kenizzites, the Kadmonites, 20 the Hittites, the Perizzites, the Rephaim, 21 the Amorites, the Canaanites, the Girgashites, and the Jebusites.”
In the New Covenant we see the priest divide the body of Christ in two and then display the two halves. Then he say “Behold the Lamb of God”. Just like the halves of the animals of the Old Covenant. This is so just like Abraham; we can enter into the New Covenant. It is so important to understand that this happen at the Lamb’s Supper. At this Feast we enter into the New Covenant with God.