Contradiction with Genesis 2:2
God's work of creation is described as finished, while Revelation 21:6 presents a different completion with the fulfillment of salvation and the new creation.
Genesis 2:2: And on the seventh day God ended his work which he had made; and he rested on the seventh day from all his work which he had made.
Contradiction with Hebrews 4:3
This verse refers to God's works being finished from the foundation of the world, contrasting Revelation 21:6 where the end and fulfillment of all things are announced.
Hebrews 4:3: For we which have believed do enter into rest, as he said, As I have sworn in my wrath, if they shall enter into my rest: although the works were finished from the foundation of the world.
Contradiction with John 19:30
Jesus' declaration "It is finished" on the cross implies completion of salvation's groundwork, while Revelation 21:6 marks the consummation of God's plan with the new creation.
John 19:30: When Jesus therefore had received the vinegar, he said, It is finished: and he bowed his head, and gave up the ghost.
Contradiction with Colossians 1:16-17
All things are already created and held together by Christ, yet Revelation 21:6 speaks to the final fulfillment and new beginning of creation.
Colossians 1:16-17: For by him were all things created, that are in heaven, and that are in earth, visible and invisible, whether [they be] thrones, or dominions, or principalities, or powers: all things were created by him, and for him:
Contradiction with Ecclesiastes 1:4
The verse notes the earth abiding forever, which seems contrary to the new heaven and the earth's creation being finalized in Revelation 21:6.
Ecclesiastes 1:4: [One] generation passeth away, and [another] generation cometh: but the earth abideth for ever.