Contradiction with Isaiah 64:6
Describes all righteousness as filthy rags, contradicting the portrayal of pure righteous acts in Revelation 19:8.
Isaiah 64:6: But we are all as an unclean [thing], and all our righteousnesses [are] as filthy rags; and we all do fade as a leaf; and our iniquities, like the wind, have taken us away.
Contradiction with Romans 3:10
States there is none righteous, while Revelation 19:8 describes righteousness of saints.
Romans 3:10: As it is written, There is none righteous, no, not one:
Contradiction with Ecclesiastes 7:20
Asserts no one on earth is righteous, contradicting the righteousness depicted in Revelation 19:8.
Ecclesiastes 7:20: For [there is] not a just man upon earth, that doeth good, and sinneth not.
Contradiction with Isaiah 53:6
Indicates everyone has gone astray, conflicting with the righteous acts mentioned in Revelation 19:8.
Isaiah 53:6: All we like sheep have gone astray; we have turned every one to his own way; and the LORD hath laid on him the iniquity of us all. [laid...: Heb. made the iniquity of us all to meet on him]
Paradox #1
Revelation 19:8 is generally seen as a celebration of purity and righteousness. A potential contradiction or conflict might come from the idea that only those who are deemed righteous get rewarded, which could be seen as exclusionary. Another perspective might question the nature of righteousness being based on deeds, as it may conflict with the concept of grace being freely given irrespective of actions.