Practice Burning the Red Heifer

The requirement of a Red Heifer is probably the most enigmatic biblical commandment, and one that continues to capture the imaginations of Jews and Christians alike. The preparation and purpose of the Red Heifer as described in Numbers 19 indicates that the entire Temple service depends on the presence of water mixed with Red Heifer ash, the one and only means of purifying one who has come in contact with a corpse. 

Since ascending the Temple Mount required purity, and it is assumed that everybody has either knowingly or unknowingly been made impure by coming in contact with death, no one can enter the Temple court until a Red Heifer is found and properly prepared.

It is for this reason that to this day, Jews are religiously forbidden from entering the area that was once the inner court of the Temple. Religious Jews who do ascend the Temple Mount first immerse themselves in a ritual bath, but that’s only good enough to get them into what was the outer courts, not to be confused with the Temple itself. This is the reason why until today Jews are not allowed to enter the Temple parameters. Those who do ascend, immerse themselves first in ritual bath, that only allows entering the Mount, that is not to be confused with the Temple itself. 

The short of it is that without the Red Heifer, the Temple can’t be rebuilt.

The absence of the Temple, in turn, means that the full redemption of Israel is impossible, since according to Ezekiel 36, only the sprinkling of the Red Heifer water allows for the complete change of heart and spirit (“then I shall sprinkle pure waters upon you, and you shall be clean, from all your uncleanness, and from all your idols, will I cleanse you. I will also give you a new heart, and I will place within you a new spirit”).

The reason why so many Christians are enamored with the Red Heifer is because they, too, understand that the Third Temple means not only redemption for Jews, but also redemption of the world. Likewise, both Jews and Christians share the belief that when Messiah will arrive, he will enter the Temple. So, for him to come, there must be a Temple.

https://www.israeltoday.co.il/read/getting-ready-temple-institute-practices-burning-the-red-heifer/