Contradiction with James 2:17
While 2 Corinthians 9:1 discusses the readiness of the Corinthians to give, indicating their willingness and preparedness, James 2:17 states that faith by itself, if not accompanied by action, is dead, which can be seen as contradictory because it emphasizes the necessity of action over readiness or intention alone.
James 2:17: Even so faith, if it hath not works, is dead, being alone. [alone: Gr. by itself]
Contradiction with Matthew 6:3
2 Corinthians 9:1 involves boasting about the readiness to give, whereas Matthew 6:3 advises that when giving, one should not let their left hand know what the right hand is doing, suggesting that giving should be done in secret rather than being publicly proclaimed.
Matthew 6:3: But when thou doest alms, let not thy left hand know what thy right hand doeth:
Contradiction with Luke 12:33
While 2 Corinthians 9:1 is focused on the readiness and willingness to give, Luke 12:33 advocates for selling possessions and giving to the poor, which suggests a more radical action rather than just preparation or intention.
Luke 12:33: Sell that ye have, and give alms; provide yourselves bags which wax not old, a treasure in the heavens that faileth not, where no thief approacheth, neither moth corrupteth.