(2 Corinthians 1:13-14) 13 For we write nothing else to you than what you read and understand, and I hope you will understand until the end; 14 just as you also partially did understand us, that we are your reason to be proud as you also are ours, in the day of our Lord Jesus.
(2 Corinthians 5:10) 10 For we must all appear before the judgment seat of Christ, so that each one may be recompensed for his deeds in the body, according to what he has done, whether good or bad.
Compare 2 Corinthians 5:10 to Daniel 12:2, Matthew 16:27-28
(Daniel 12:2) 2 "Many of those who sleep in the dust of the ground will awake, these to everlasting life, but the others to disgrace and everlasting contempt.
(Matthew 16:27-28) "For the Son of Man is going to come in the glory of His Father with His angels, and WILL THEN REPAY EVERY MAN ACCORDING TO HIS DEEDS. "Truly I say to you (the disciples), there are some of those who are standing here who will not taste death until they see the Son of Man coming in His kingdom."
They are speaking of the judgment that accompanies the second coming of Christ that was imminent to that first century generation of people.