The 144,000 first born males of Israel were the replacements for the first born who died in Egypt. Every life had to be accounted for. From the age of birth to the age of twelve years old. None were defiled by the corruption of the world,and they touched no woman. they were without spot, or blemish.These were not death sacrifices on the alter like the animals were. They had to go through a procedure in order for God to redeem them. None lived past the age of twelve. At their appointed time, they were taken up by God. This continued year, after year until the number had been fulfilled. twelve thousand had to come from each tribe of Israel. The twelve tribes. These are the 144,000 servants of God in Heaven.