Jewish tradition says that the tenth (and final) Red Heifer will be burned by the Messiah at the time of the rebuilding of the Temple (Mishnah, Parah 3:5).

For background on the importance of a PERFECTLY RED Heifer, 3 years old, female, to the building (rebuilding) of the Holy Temple, read my post “Numbers 19: The Red Heifer has been found

In the book of Daniel, in talking of the Beast (anti-Christ), we find that at some point he returns to Israel and sits in the Temple of God, saying he IS God (This, by the way is when Satan enters and possesses the Anti-Christ).  Of course, since the Holy Temple was destroyed ~70 AD by the Roman Empire, it follows that a 3rd Holy Temple must be built, right where the Dome of the Rock sits today.  Note also that Daniel says the people who do know their God shall do exploits in His name.  Of course, if you do NOT know God, and do NOT know the  Bible, you will NOT know this is the time to do exploits against the AntiChrist…

Book of Daniel Chapter 11:

{11:28} Then shall he (Beast/AntiChrist) return into his land with great riches; and his heart [shall be] against the holy covenant; and he shall do [exploits,] and return to his own land.

{11:31} And arms shall stand on his part, and they shall pollute the sanctuary of strength, and shall take away the daily [sacrifice,] and they shall place the abomination that maketh desolate.

{11:32} And such as do wickedly against the covenant shall he corrupt by flatteries: but the people that do know their God shall be strong, and do [exploits. ]

In the Book of Mark, after Jesus fortells of the destruction of the (then existing) 2nd Holy Temple, His disciples asks him when that will happen and what will the final signs of the times be.  Note two things:  Jesus references the Book of Daniel and the Holy Temple (there is no Holy Temple now, so it follows the 3rd Holy Temple will have to be built), and He says what will happen at the LAST TRUMP:  That He will send the angels, at the moment He appears in the sky, to gather His Elect from the four corners of the world.  This is the “Rapture”, not a hidden thing that happens with sudden disappearance of millions of people.  This is the “last trump” mentioned in the Book of Revelation and 1 Thessalonians 4:16-18.

Book of Mark: (The words of Jesus)

{13:14} But when ye shall see the abomination of desolation, spoken of by Daniel the prophet,  standing where it ought not, (let him that readeth understand,) then let them that be in Judaea flee to the mountains:

{13:20} And except that the Lord had shortened those days, no flesh should be saved: but for the elect’s sake, whom he hath chosen, he hath shortened the days.

{13:21} And then if any man shall say to you, Lo, here [is] Christ; or, lo, [he is] there; believe [him]  not:

{13:22} For false Christs and false prophets shall rise, and shall shew signs and wonders, to  seduce, if [it were] possible, even the elect.

{13:26} And then shall they see the Son of man coming in the clouds with great power and glory.

{13:27} And then shall he send his angels, and shall gather together his elect from the four winds, from the uttermost part of the earth to the uttermost part of heaven.

Take ye heed, watch and pray: for ye know not when the time is.

{13:37} And what I say unto you I say unto all, Watch.

So, though as Christians we should not place undo importance to the rebuilding of the Temple, in this one thing it is critically important to understand and watch:

a.  The Holy Temple must be rebuilt before the AntiChrist makes his appearance.  The Red Heifer will be used BY THE MESSIAH to consecrate the Holy Temple.  This “MESSIAH” is the one Jesus referred to in John 5:43:  “I have come in My Father’s name, and you do not receive Me; if another comes in his own name, you will receive him.”  Jesus IS the real Messiah; the AntiChrist will be the false Messiah.

b.  For the Holy Temple to be rebuilt, a perfect red heifer shall be required.

c.  The Red Heifer is actively being sought.

d.  Almost everything needed to rebuild the temple is in place.

e.  Remember that Jesus commanded all to WATCH.  This means you cannot be distracted with the cares of this world, of which Christians are only sojourners.