In Revelation 7 the 144,000 are on earth: "Do not harm the earth, the sea, or the trees till we have sealed the servants of our God on their foreheads." And I heard the number of those who were sealed. One hundred and forty-four thousand..." (Revelation 7:3-4).
In Revelation 14 the 144,000 are in heaven: "Then I looked, and behold, a Lamb standing on Mount Zion, and with Him one hundred and forty-four thousand...for they are without fault before the throne of God" (Revelation 14:1, 5).
As long as we follow the Lamb on earth, we will end up in Heaven: "These are the ones who follow the Lamb wherever He goes" (Revelation 14:4).
Jason Cicero