Then I looked, and there before me was the Lamb, standing on Mount Zion, and with him 144,000who 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 remained virgins. They follow the Lamb wherever he goes. They were purchased from among mankind and offered as firstfruits to God and the Lamb. 5 No lie was found in their mouths; they are blameless. (Revelation 14:1-5)
These 144,000 believers who will stand with Christ on Mount Zion in the future are described having “no lie… in their mouths; they are blameless.” Of course there is no one who does not sin. But these people, like all true believers had their sins forgiven when they were “purchased from among mankind” by the blood of the lamb. All people who believe in Jesus and repent will have their sins forgiven, and made blameless by God’s power.
These 144,000 are referred to as the “firstfruits to God and the Lamb.” They are just a few of the many millions who will be united with Christ forever.