The phrase appears in Paul’s second letter to the Church at Corinth chapter 5.
2 Corinthians 5:10 For we must all appear before the judgment seat of Christ, that each one may receive the things done in the body, according to what he has done, whether good or bad.
Paul writes to the Church at Galatia in a similar vein:
Galatians 6:7 Do not be deceived, God is not mocked; for whatever a man sows, that he will also reap. 8 For he who sows to his flesh will of the flesh reap corruption, but he who sows to the Spirit will of the Spirit reap everlasting life.
All are judged.
Ecclesiastes 12:14 For God will bring every work into judgment, Including every secret thing, Whether good or evil.
Hebrews 9:27 And as it is appointed unto men once to die, but after this the judgment
This judgment has been put into the hands of Jesus Christ.
John 5:22 "For the Father judges no one, but has committed all judgment to the Son
There are three classes of people:
Judgment will take place when Jesus Christ returns from heaven to establish the kingdom of God and to raise from the dead those who are deemed to be responsible
Acts 17:31 "because He (God) has appointed a day on which He will judge the world in righteousness by the Man whom He has ordained. He has given assurance of this to all by raising Him from the dead."
John 5:28 Do not be astonished at this; for the hour is coming when all who are in their graves will hear his voice 29 and will come out—those who have done good, to the resurrection of life, and those who have done evil, to the resurrection of condemnation.
I hope this helps