144,000 People
144,000 Jewish men who meet God's requirements.
it appears these Jews are in heaven with Jesus as the lamb is one of his titles.
The 144,000 revived Jewish apostolic evangelists of Revelation Seven will take the Word of the Lord out from Zion to Revive the rest of the nations.
Background Reading:
Revelation 14:1-5
The Lamb and the 144,000
14Then I looked, and there before me 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. 2 And I heard a sound from heaven like the roar of rushing waters and like a loud peal of thunder. The sound I heard was like that of harpists playing their harps. 3 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. 4 These are those who did not defile themselves with women, for they kept themselves pure. They follow the Lamb wherever he goes. They were purchased from among men and offered as firstfruits to God and the Lamb. 5 No lie was found in their mouths; they are blameless.