The book of Revelation first mentions 144,000 who are sealed here,
These 144,000 are also said to be redeemed from the earth,
And they are said to be first fruits and follow Jesus Christ wherever he goes,
So who are the 144,000 of all the tribes of Israel? The 144,000 are all the chosen that belong to Jesus Christ at his second coming, as these are first gathered to him at his second coming, and thus they will always follow be with the Lord wherever he goes,
And the chosen are also said to be first fruits,
And the chosen are also redeemed,
And the chosen have also been purchased,
And thus the chosen will be as virgins at the resurrection of the second coming, as they will not marry nor be given into marriage, thus not "defiling themselves with women",
And all who are chosen are grafted into the olive tree of Israel, to thus be accounted into one of the tribes of Israel,
And the chosen are the remnant of the 144,000 also mentioned here, who are also chosen before the foundation of the world,
And as such, although many are certainly called, only a small remnant of 144,000 are chosen,
Then I heard the number of those who were sealed: 144,000 from all the tribes of Israel. (Revelation 7:4 [NIV])
And they sang a new song before the throne and before the four living creatures and the elders. No one could learn the song except the 144,000 who had been redeemed from the earth. (Revelation 14:3 [NIV])
These are those who did not defile themselves with women, for they remained virgins. They follow the Lamb wherever he goes. They were purchased from among mankind and offered as firstfruits to God and the Lamb. (Revelation 7:4 [NIV])
Then we who are alive, who are left, will be caught up together with them in the clouds to meet the Lord in the air, and so we will always be with the Lord. (1 Thessalonians 4:7 [ESV])
He chose to give us birth through the word of truth, that we might be a kind of firstfruits of all he created. (James 1:18 [ESV])
In him we have redemption through his blood, the forgiveness of sins, in accordance with the riches of God's grace (Ephesians 1:7 [NIV])
for you were bought with a price. So glorify God in your body. (1 Corinthians 6:20 [ESV])
At the resurrection people will neither marry nor be given in marriage; they will be like the angels in heaven. (Matthew 22:30 [ESV])
After all, if you were cut out of an olive tree that is wild by nature, and contrary to nature were grafted into a cultivated olive tree, how much more readily will these, the natural branches, be grafted into their own olive tree! I do not want you to be ignorant of this mystery, brothers and sisters, so that you may not be conceited: Israel has experienced a hardening in part until the full number of the Gentiles has come in, and in this way all Israel will be saved. As it is written: "The deliverer will come from Zion; he will turn godlessness away from Jacob. (Romans 11:24-26 [NIV])
So too, at the present time there is a remnant chosen by grace. (Romans 11:5 [NIV])
even as he chose us in him before the foundation of the world, that we should be holy and blameless before him. In love (Ephesians 1:4 [ESV])
"For many are invited, but few are chosen." (Matthew 22:14 [NIV])