Contradiction with 1 Kings 8:46
This verse implies that there is no one who does not sin, contradicting the claim in Psalms 18:22 of maintaining all God's statutes without fail.
1 Kings 8:46: If they sin against thee, (for [there is] no man that sinneth not,) and thou be angry with them, and deliver them to the enemy, so that they carry them away captives unto the land of the enemy, far or near;
Contradiction with Romans 3:23
This verse states that all have sinned, which contradicts the assertion in Psalms 18:22 of keeping all God's judgments perfectly.
Romans 3:23: For all have sinned, and come short of the glory of God;
Contradiction with Ecclesiastes 7:20
This verse says there is not a righteous man on earth who continually does good and never sins, which contradicts the idea of perfectly keeping God’s commandments.
Ecclesiastes 7:20: For [there is] not a just man upon earth, that doeth good, and sinneth not.
Contradiction with Isaiah 64:6
It suggests that all righteous acts are like filthy rags, contradicting the claim of perfect adherence to God's laws in Psalms 18:22.
Isaiah 64:6: But we are all as an unclean [thing], and all our righteousnesses [are] as filthy rags; and we all do fade as a leaf; and our iniquities, like the wind, have taken us away.
Contradiction with 1 John 1:8
This verse says if we claim to be without sin, we deceive ourselves and contradicts the claim of perfect observance in Psalms 18:22.
1 John 1:8: If we say that we have no sin, we deceive ourselves, and the truth is not in us.