Contradiction with Proverbs 28:13
While Psalms 9:13 asks for mercy, Proverbs 28:13 suggests that mercy is contingent upon confessing and forsaking sins.
Proverbs 28:13: He that covereth his sins shall not prosper: but whoso confesseth and forsaketh [them] shall have mercy.
Contradiction with Galatians 6:7
Contrasts with Psalms 9:13 on the principle of mercy by highlighting that a man reaps what he sows without mention of mercy.
Galatians 6:7: Be not deceived; God is not mocked: for whatsoever a man soweth, that shall he also reap.
Contradiction with James 2:13
Suggests that judgment without mercy will be shown to those who have not been merciful, while Psalms 9:13 focuses on pleading for mercy.
James 2:13: For he shall have judgment without mercy, that hath shewed no mercy; and mercy rejoiceth against judgment. [rejoiceth: or, glorieth]
Contradiction with Romans 2:6
Emphasizes judgment according to one's deeds, contrasting with the plea for mercy found in Psalms 9:13.
Romans 2:6: Who will render to every man according to his deeds:
Contradiction with Ezekiel 18:20
States that the soul who sins shall die, standing in contrast to the plea for mercy upon sinners in Psalms 9:13.
Ezekiel 18:20: The soul that sinneth, it shall die. The son shall not bear the iniquity of the father, neither shall the father bear the iniquity of the son: the righteousness of the righteous shall be upon him, and the wickedness of the wicked shall be upon him.