We believe that when the Lord comes again, man’s body will be transformed into a holy body instantly. Why does God still need to do the work of judgment and chastisement?

The answer from God’s word:

“In His final work of concluding the age, God’s disposition is one of chastisement and judgment, which reveals all that is unrighteous, and publicly judges all peoples, and perfects those who truly love Him. Only a disposition such as this can bring the age to an end. The last days have already arrived. All things will be classed according to kind, and will be divided into different categories based on their nature. This is the time in which God reveals the end and the destination of man. If man does not undergo chastisement and judgment, then there will be no way of revealing the disobedience and unrighteousness of man. Only through chastisement and judgment can the end of all things be revealed. Man only shows his true colors when he is chastised and judged. Evil shall return to evil, good shall return to good, and man shall be classified according to kind. Through chastisement and judgment, the end of all things shall be revealed, so that the evil shall be punished and the good shall be rewarded, and all people shall become subject under the dominion of God. All the work requires righteous chastisement and judgment to be achieved. Because man’s corruption has reached its peak and his disobedience has been too serious, only God’s righteous disposition, which is principally one of chastisement and judgment, and is revealed during the last days, can fully transform and complete man. Only this disposition can expose evil and thus severely punish all the unrighteous.”

from “The Vision of God’s Work (3)” in The Word Appears in the Flesh