Impossible, Rare or Well Done: Can We Bring Korbanot in Today's World?

(1) The commandment of building the Choice House: To build a house for the sake of God, meaning to say that we would bring sacrifices to Him, and there would be the location of aliyah l'regel (pilgrimage) where all Israel would gather each year, as it is written "and you shall make for Me a sanctuary." And this mitzvah includes making all the vessels necessary for the Temple service like the menorah, the shulchan, the altar and the other vessels...

(16) And this commandment is practiced at the time that most of Israel is upon their land. And this is from the commandments that are not impingent upon the individual, but rather upon all of the community. When the Temple is built, speedily in our days, a positive commandment will be fulfilled.

An alternative answer: That it is built on the 15th of Nisan near sunset etc. And if you ask "but we don;t build the Temple at night" as it is established in tractate Shavuot (15b) that we do not build the Temple at night, as it is written "and it was on the day the mishkan was raised up" and also we do not build the Temple on the 15th, which is a holiday, as it is established there in Shavuot that the building of the Temple does not override the requirement to rest on Shabbat, the answer is this:

These words only refer building done by human hands. But the future Temple which we await will be built and complete and revealed and brought forth from Heaven, as it is written "mikedash Hashem konenu yadecha."

SEPARATE YOURSELVES FROM AMONG THIS CONGREGATION, THAT I MAY CONSUME THEM IN A MOMENT... Moreover, in addition to [being punished for] the census, there was a punishment upon the people [already] at the beginning of this matter, as it is written, And again the anger of the Eternal was kindled against Israel, and He moved David against them, [saying: ‘Go, number Israel and Judah’].
Now Rashi wrote there: “I do not know why [G-d’s anger was kindled against Israel].” And I say by way of explanation that Israel was punished because of the delay in the building of the Sanctuary, since the ark went from tent to tent as a stranger in the Land, and none of the tribes bestirred themselves to say, “Let us seek G-d and build a house to His Name, just as it is written, even unto His habitation shall ye seek, and thither thou shalt come.” [This situation continued] until David was roused to action in this matter after many years and a long period of time [had elapsed since he had become king], as it is said, And it came to pass, when the king dwelt in his house, and the Eternal had given him rest from all his enemies round about, that the king said unto Nathan the prophet: ‘See now, I dwell in a house of cedar, but the ark of G-d dwelleth within curtains.’ Now G-d, blessed be He, prevented David [from building the Sanctuary], because He said, for thou hast shed much blood upon the earth in My sight, and thus the building was [further] delayed until the reign of Solomon. But had Israel really desired this matter [and really wanted to build the Sanctuary], and had they bestirred themselves to action from the start, it would have been done [already] in the days of one of the Judges, or in the days of Saul, or even in the days of David. For had the tribes of Israel aroused themselves in this matter, he [David] would not have been [considered] the builder, but Israel would have been the builders.

(Devarim 12:5) "But to the place that the L-rd your G-d will choose of all your tribes": by word of a prophet. I might think, wait until a prophet tells you; it is, therefore, written "His dwelling shall you seek and you shall come there": Seek to find it and then the prophet will tell you.

(6)...Rabbi Joshua said: I have heard that sacrifices may be offered even though there is no Temple, and that the most holy sacrifices may be eaten even though there are no curtains, and the less holy sacrifices and second tithes even though there is no wall [around Jerusalem]; because the first sanctification sanctified both for its own time and for the time to come.

The Gemara asks: Granted, with regard to the location of the House, its shape was discernable from the vestiges of its foundations; but how did they know the proper location of the altar? The Gemara answers that Rabbi Elazar says: They saw a vision of the altar already built and Michael the archangel standing and sacrificing offerings upon it. And Rabbi Yitzḥak Nappaḥa says: They saw a vision of the ashes of Isaac that were placed in that location. And Rabbi Shmuel bar Naḥmani says: From the entire House they smelled the scent of incense, yet from there, the location of the altar, they smelled a scent of burned animal limbs. Rabba bar bar Ḥana says that Rabbi Yoḥanan says: Three prophets ascended with them from the exile: One who testified to them about the size and shape of the altar, and one who testified to them about the proper location of the altar, and one who testified to them that one sacrifices offerings even if there is no Temple, provided that there is a proper altar. It was taught in a baraita that Rabbi Eliezer ben Yaakov says: Three prophets ascended with the Jewish people from the exile: One who testified to them about the size and shape of the altar and about the proper location of the altar, and one who testified to them that one sacrifices offerings even if there is no Temple, and one who testified to them about the Torah and instructed that it be written in Assyrian script [Ashurit] rather than the ancient Hebrew script used in the times of Moses.

Therefore, all of the sacrifices may be brought even though the temple has not been built. The Holiest sacrifices may be eaten throughout the courtyard, even though it is destroyed and there are no walls surrounding it. And sacrifices of lesser holiness and Second Tithe may be eaten in all of Jerusalem, even though there are no walls because the initial holiness is eternal holiness.

(1) The altar is placed extremely precisely and may never ever be placed anywhere else as it says "This is the Altar for the offerings of Israel." And it was in the temple that Isaac was bound as it says "and go to the land of Moriah" and it says "Solomon built the temple on Mt. Moriah."

(2) And it is a tradition accepted by all, that the place where David and Solomon built the altar at the threshing floor of Arauna was the place that Abraham built the altar and bound Isaac upon it, and that was the place that Noah built upon when he left the ark, and that was the altar upon which Kain and Abel sacrificed, and upon which Adam the First sacrificed when he was created. And from there was born the saying of the sages that "Man was created from the place of his atonement."

(3) The measurements of the Altar are very exact and its shape is known [by tradition] from man to man. The altar that those who ascended from the [Babylonian] exile built was made like the one which will be built in the future. It is forbidden to add or subtract from its dimensions.

(4) Of the three prophets who ascended with them from the exile, one testified as to the Altar's location, one to its dimensions, and one to the Law that the could bring offerings on the altar even though the there was no Temple [yet].

Rabbi Yehuda said to him: Leave the case of the High Priest on Yom Kippur, as the atonement of the frontplate is unnecessary because the prohibition of performing the Temple service in impurity is permitted (hutrah) in cases involving the public. Learn by inference that Rabbi Shimon holds that impurity is overridden (dechuya) in cases involving the public, and that is why the atonement of the frontplate is necessary.

(1) All the priests in our day are priests by assumption (kohen chazakah) and they only partake in holy food that can be consumed within the borders [of eretz yisrael], meaning rabbinic Teruma however of Torah ordained Teruma and of Torah ordained Hallah only a priest with definite lineage may partake.

(2) Who is a priest with definite lineage (kohen meyuchas)? Anyone about whom two witnesses testified that he is a priest and the son of john doe priest the son of john doe priest until we arrive at a man [whose priesthood] does not need to to be checked and he is a priest who served at the altar for had the Sanhedrin not checked after his status they would not have permitted him to serve.Similarly, in the present era, terumah is a Rabbinic commandment.11 Therefore it is eaten by the priests of our era [whose lineage is established merely] by presumption.Similarly, in the present era, terumah is a Rabbinic commandment.11 Therefore it is eaten by the priests of our era [whose lineage is established merely] by presumption.

...therefore according to my humble view, there is no need for established priests (kohen meyuchas), and to eat of the korban Pesach it is permissible when the community is impure, and there is no need for Shekalim [the half-shekel used to fund communal sacrifices] or a Kohen Gadol.

The garments dyed techeilet and argaman and tola'at shani and sheish moshzar are each essential [cannot be omitted or the service will be invalid]. The 8 garments of the Kohen Gadol are each essential, the 4 garments of the regular kohanim are each essential, the shoham and miluim stones are each essential.