Contradiction with James 1:17
James 1:17 speaks of God's unchanging nature in giving good gifts, which contradicts the notion of Barzillai's refusal to accept rewards and material gifts from David in 2 Samuel 19:31.
James 1:17: Every good gift and every perfect gift is from above, and cometh down from the Father of lights, with whom is no variableness, neither shadow of turning.
Contradiction with Matthew 6:19-20
In Matthew 6:19-20, storing treasures in heaven rather than on earth is encouraged, while in 2 Samuel 19:31, Barzillai refuses earthly rewards from King David.
Matthew 6:19-20: Lay not up for yourselves treasures upon earth, where moth and rust doth corrupt, and where thieves break through and steal:
Contradiction with Proverbs 19:17
Proverbs 19:17 suggests that lending to the Lord will bring a reward, contrasting with Barzillai's refusal of David's offer in 2 Samuel 19:31.
Proverbs 19:17: He that hath pity upon the poor lendeth unto the LORD; and that which he hath given will he pay him again. [that which...: or, his deed]