Mysteries in Daniel 12
Dan 12:1 At that time Michael shall stand up, the great prince who stands watch over the sons of your people; and there shall be a time of trouble, such as never was since there was a nation, even to that time. And at that time your people shall be delivered, everyone who is found written in the book."
Archangel Michael is responsible to watch over the troublesome Israel since its re-formation until the remnants, whose names can be found in the book of life, are saved.
This confirms that the death of Jesus on the cross started His new covenant of grace and made obsolete the Mosaic Law of the Old Covenant sending the Jews to damnation in the lake of fire.
Rev 20:14b And anyone not found written in the Book of Life was cast into the lake of fire.
Which Israelites can be Saved?
John 5:46-47 "For if you believed Moses, you would believe Me; for he wrote about Me. But if you do not believe his writings, how will you believe My words?"
Our Lord told the Israelites that devout Jews who believed Moses will be saved for they will also believe Jesus as the Christ.
John the Baptist's mission was to get the Jews to repent and become devout Jews by keeping Moses Law and the Prophets. Our Lord Jesus and His disciples too preached repentance so that after His crucifixion, the repented and devout Jews will believe the gospel and accept Him as their Messiah.
On Pentecost, Peter preached the gospel of Jesus to the Jews and 3,000 devout Jews repented and became Christians.
Acts 2:5,41 And there were dwelling in Jerusalem Jews, devout men, from every nation under heaven. Then those who gladly received his word were baptized; and that day about three thousand souls were added to them.
Remnants Accepted Jesus
Zech 2:10 "And I will pour on the house of David and on the inhabitants of Jerusalem the Spirit of grace and supplication; then they will look on Me whom they pierced. Yes, they will mourn for Him as one mourns for his only son, and grieve for Him as one grieves for a firstborn.
When the whole heaven darkens our Lord Jesus with His angels falling like stars from heaven will come to gather His elects (all overcoming Christians)
Devout Israelites who have not bowed down to worship the Antichrist, see Jesus coming in the clouds, all of them will immediately repent of their sins and unbelief and accept Him as their Messiah. They will then be sealed so that the wrath of God will not harm them. These will be the 144,000 Jews in Rev 7.
Rev 7:3-4 saying, "Do not harm the earth, the sea, or the trees till we have sealed the servants of our God on their foreheads." And I heard the number of those who were sealed. One hundred and forty-four thousand of all the tribes of the children of Israel were sealed;
Rom 11:25-26a For I do not desire, brethren, that you should be ignorant of this mystery, lest you should be wise in your own opinion, that blindness in part has happened to Israel until the fullness of the Gentiles has come in. And so all Israel will be saved.
The Jews now are still blind and we must not follow them in their Jewish feasts, traditions, celebrations and the building of the 'temple of God' (for the Antichrist).
God will only open their eyes at rapture.