Contradiction with Genesis 49:10
This verse implies the scepter will not depart from Judah, suggesting a permanence that could contradict ending David's throne.
Genesis 49:10: The sceptre shall not depart from Judah, nor a lawgiver from between his feet, until Shiloh come; and unto him [shall] the gathering of the people [be].
Contradiction with 1 Samuel 13:13-14
Samuel tells Saul his kingdom will not continue because God sought a man after his own heart, implying that God's covenants are conditional, contrary to the unconditional covenant in Jeremiah 33:21.
1 Samuel 13:13-14: And Samuel said to Saul, Thou hast done foolishly: thou hast not kept the commandment of the LORD thy God, which he commanded thee: for now would the LORD have established thy kingdom upon Israel for ever.
Contradiction with 1 Kings 9:5-7
God tells Solomon that his throne shall not fail if he obeys, implying conditions to maintain the kingdom, unlike the everlasting context of Jeremiah 33:21.
1 Kings 9:5-7: Then I will establish the throne of thy kingdom upon Israel for ever, as I promised to David thy father, saying, There shall not fail thee a man upon the throne of Israel.
Contradiction with Psalm 89:33-34
The Psalm suggests God will not break His covenant despite disobedience, which might contradict the possibility of breaking David's line in Jeremiah 33:21.
Psalm 89:33-34: Nevertheless my lovingkindness will I not utterly take from him, nor suffer my faithfulness to fail. [will...: Heb. I will not make void from him] [to fall: Heb. to lie]
Contradiction with Hebrews 7:12
This verse discusses a change in priesthood, implying a change in law that may question the unchangeable nature of the covenant with David's line.
Hebrews 7:12: For the priesthood being changed, there is made of necessity a change also of the law.