144,000

144,000 (Greek: ἑκατὸν τεσσαράκοντα τέσσαρες χιλιάδες ) is a number that was revealed to the apostle John, at least three times in a vision he had, at the turn of the 1st century. Its significance concerned the number of servants that make up a spiritual tribe of Israel who will rule in God's Kingdom of heaven (Revelation 5:9,10).

Israel of God
c.96 CE, apostle John saw in a vision the things that the apostle Paul had taught the congregations earlier: that God was extending his kingdom arrangement to "non-Jews" (more importantly non-descendants of Abraham). Apostle Paul identified them as the "Israel of God" (Ἰσραὴλ τοῦ θεοῦ).-Galations 6:15, 16, (compare Matthew 3:9). Paul referred to the Hebrew prophet, Hosea, where God (Jehovah) said: “I will call them ‘my people’ who are not my people; and I will call her ‘my loved one’ who is not my loved one,” (Romans 9:22-25); compare Hosea 2:23) to show that God would extend his promise to Abraham to a spiritual nation (Matthew 21:43), which includes some natural Jews and "the Gentiles".

Tribes of Israel
Apostle John describes Paul's "Israel of God" as coming from each tribe of Israel: "And I heard how many were marked with the seal of God —144,000 were sealed from all the tribes of Israel" (Revelation 7:4). Comparatively, apostle John's list of "all the tribes of Israel" in his vision, do not completely match the descendant list of natural Israel given in Numbers chapter 1. John further describes in his vision that before him was "the Lamb, standing on Mount Zion, and with him 144,000 who had his name and his Father’s name written on their foreheads" (Revelation 14:1) and "they were purchased from among mankind." (Revelation 14:4).

Jehovah's Witnesses
Out of ≈8,000,000 (million) Jehovah's Witnesses, only an estimated few thousand alive today, identify with the 144,000 servants, of the spiritual tribe of Israel, who earnestly await to receive the "seal on the foreheads" —Rev.7:3 and have "the Lamb's name and his Father’s name written on their foreheads"—Rev.14:1