Contradiction with Deuteronomy 9:5
This verse suggests that possession of the land is not due to the righteousness of the Israelites, whereas Joshua 14:9 references an inheritence based on faithfulness.
Deuteronomy 9:5: Not for thy righteousness, or for the uprightness of thine heart, dost thou go to possess their land: but for the wickedness of these nations the LORD thy God doth drive them out from before thee, and that he may perform the word which the LORD sware unto thy fathers, Abraham, Isaac, and Jacob.
Contradiction with Psalm 37:29
Implies that the righteous shall inherit the land and dwell forever, contrasting Joshua 14:9, which was a specific land promise fulfilled over time.
Psalm 37:29: The righteous shall inherit the land, and dwell therein for ever.
Contradiction with Matthew 5:5
States the meek shall inherit the earth, which conflicts with Joshua 14:9's focus on inheritance based on a promise to a specific individual.
Matthew 5:5: Blessed [are] the meek: for they shall inherit the earth.