The 144,000, as mentioned in Revelation 7:1-8 and 14:1-5, refer to 144,000 Jews that were chosen by God and sealed by Him as His servants, with 12,000 coming from each of the 12 tribes of Israel. In the Left Behind books, their purpose was to evangelize to the world the gospel message about Jesus Christ being the only way of salvation. These first appeared in "Left Behind" and were sealed by God along with other believers in "Soul Harvest".

Notably, the book series took artistic liberty in defining who the 144,000 were, as Revelation 14:4 describes them as virginal men who "have not defiled themselves with women", and Tsion Ben-Judah, a married man who became a widower, mentioned that he was one of the 144,000 in "Soul Harvest".

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