144,000 persons are mentioned in The Book of Revelation (Rev 7:1–8),
see the article: Who are the 144,000?
We have the following clues to identify these people and when they appear:
- It says: "Do not harm the earth or the sea or the trees,
until we have sealed the servants of our God on their foreheads." (Rev 7:3).
It means that they are servants of God. - They are Jews represented by the twelve tribes of Israel mentioned
in Rev 7:4–8. But the tribe of Dan isn't mentioned, see the end part
of Man-Made Religion. This tribe is replaced by the Tribe of Manasseh.
See also in Ezekiel's Temple why the tribe of Dan is mentioned there. - These Jewish servants of God are "...sealed...on their foreheads" (Rev 7:3).
Apostle Paul spoke of believers being "sealed" by the Holy Spirit
(2 Cor 1:22, Eph 1:13, 4:30), common language for born again believers.
This seal of the Lord is uniquely visible so that John can know without a doubt who these people are: Jews who have put their faith in Jesus Christ. - The first verse of Rev 7 begins with the words: "After this..." Chapter 6 describes the opening of the first six seals during the Tribulation period,
see The Horses in the Book of Revelation. This means that these Jews receive their seals after the sixth seal is broken (Rev 6:12–17),
see The Horses in the Book of Revelation. Most likely they will become
born again believers during the first half of the Tribulation period.
These Jews are servants of God who share the gospel of Jesus Christ with great signs and wonders during the Tribulation period. Many people are saved at this time. These Jews receive seals on their foreheads for protection against God's wrath (Rev 7:3), see God has wrath in God's Attributes. They will have the name of Jesus
and God the Father written on their foreheads (Rev 14:1). They are protected
from God's wrath but not from persecution. Many of them will loose their lives during the Tribulation period (Rev 14:2–5). There will be a great persecution
of the Christians during this time (Rev 7:13–17, Mat 24:15–22, Mark 13:14–20).
born again believers and through the 144,000 Jews, see The Two Witnesses.
Heb 12:18, 22–23), see time 15:03–20:29 in Hebrews 12 (Part 4) :18-29.
of the Tribulation period, the Jews will recognize him as Messiah, the One they
had previously rejected, see The Depth of the Riches in The Book of Romans.