ISAIAH 56
7 Even them will I bring to My holy mountain [Har Kodesh], and make them joyful [have simcha] in My house of prayer [Bais Tefillah]: their burnt offerings [olot] and their sacrifices [zevakhim] shall be accepted upon Mine altar [Mizbe'ach]; for Mine house [Bais] shall be called an house of prayer for all people [Bais Tefillah l'khol HaAmim].
SHILOH TO BUILD A TEMPLE.
And "there shall be no more the Canaanite in the house of the Lord of hosts " (Zech. 14:16-21; Isaiah 66:20,21,23).
Elpis Israel 2.5.
The last two quotes show who will/not be welcome to attend the temple from among the nations. It will be those who are faithful to Yahweh's covenant - not representative heads of nations. There will be no human governments in the age to come. Sovereignty belongs to the Lord Yahoshua Anointed and his immortal associates redeemed out of every nation by his shed blood.
However, a satanic rabble of usurpers under the headship of an antitypical Gog will be allowed to amass at the close of the millenium for the purpose of separating the goats from the sheep, and putting a final end to sin on earth.
When these words were written, the temple of Solomon was still standing as the house of prayer for Israel. But the prophet speaks here of a future temple, which should be a house of prayer, not for Israel only, but for all peoples. That house has not yet been erected, but will certainly be, for Zechariah testifies that the man whose name is The Branch shall build the temple of Yahweh"-a temple very minutely described by Ezekiel.
Upon the altar of this temple, then, the burnt-offerings and sacrifices of the sons of the stranger will be accepted: offerings which shall be selected from the flocks of Kedar, and the rams of Nebaioth. For, says Isaiah, the Gentiles shall come to the Light of Jerusalem, and kings to the brightness of her rising, when she shall arise and shine, and the glory of the Lord is risen upon her; and "they shall bring gold and incense; and they shall show forth the praises of the Lord. All the flocks of Kedar, shall be gathered together unto her, the rams of Nebaioth shall minister unto her; they shall come up with acceptance on mine altar and I will glorify the house of my glory.
Again, Isaiah tells us that in a time, which has hitherto never obtained, when "the Egyptians shall serve with the Assyrians, and Israel shall be the third with Egypt and Assyria, a blessing in the midst of Palestine-then shall there be an altar to the Lord in the midst of the land of Egypt, a pillar at the border thereof to Yahweh. And it shall be for a sign, and for a witness unto Yahweh of armies in the land of Egypt, for they shall cry unto the Lord because of oppressors and he shall send them a Saviour, and a Great One, and he shall deliver them. And Yahweh shall be known to the Egyptians, and the Egyptians shall know Yahweh in that day, and shall do sacrifice and oblation; yea, they shall vow a vow unto Yahweh, and perform it."
...Now the feast of Tabernacles cannot be kept without sacrifice as will appear by consulting the law by which the festival was decreed, which reads thus;
"The fifteenth day of this seventh month shall be the feast of Tabernacles, seven days unto Yahweh. On the first day shall be a holy convocation; ye shall do no servile work therein. Seven days ye shall offer an offering made by fire unto Yahweh, on the eighth day shall be a holy convocation; ye shall offer an offering made by fire unto Yahweh; it is a solemn assembly, and ye shall do no servile work therein."
For the Gentiles to keep this feast, they must observe it as the Israelites did before them, according to the law; and not as they "keep the Sabbath" now, observing the first or eighth instead of the seventh day, after a fashion of their own, and omitting those requirements which are inconvenient.
...The Feast of Passover is also to be observed in the Age to Come; which, however, cannot be kept without sacrifice. Jesus said to his disciples, "I will not any more eat of the Passover, until it be fulfilled in the kingdom of God." This was equivalent to saying, "When the Passover is fulfilled in the kingdom of God I will eat of it." Hence we find its restoration testified by Ezekiel in these words:
"On the fourteenth day of the first month ye shall have the Passover a feast of seven days; unleavened bread shall be eaten. And upon that day shall the Prince prepare (by the priests who offer his burnt-offerings and his peace-offerings, 100: 46:2) for himself and all the people of the land, a bullock for a sin-offering. And seven days of the feast he shall prepare a burnt-offering to Yahweh, seven bullocks and seven rams without blemish, daily the seven days; and a kid of the goats daily, for a sin-offering. And he shall prepare a meat-offering of an ephah for a bullock, and an ephah for a ram, and a hin of oil for an ephah. And in the next verse the feast of tabernacles is thus referred to: "In the seventh month, on the fifteenth day of the month, shall he do the like in the feast of the seven days, according to the sin-offering, according to the burnt-offering, and according to the meat-offering, and according to the oil."
The reader will observe, however, that the Passover is a feast for Israel's observance, not for that of the nations.
Herald of the Kingdom and Age to Come, Nov 1854
This is the millennial future state. Abraham and Jesus are, then, the greatest personages upon the earth; the former being the spiritual father of Jesus and the saints, and the political father of a multitude of nations, over whom Christ and His brethren rule until "the end" (1 Cor. 15:24).
Such is "the world" of which Abraham and his Seed are the heirs.
Speaking of the latter in this relation, the apostle says, "whom God hath appointed Heir of all things, and on account of whom He constitutes the Ages" (Heb.1:2) - the Age of Jubilees, and the Jubilee Age. And to the joint-heirs of Abraham and Christ He says,
"Let no man glory in men: for all things are yours; the world, life, death, things present and things to come; all are yours; and ye are Christ's; and Christ is God's" (1 Cor. 3:21-23).
Elpis Israel 2.2.