Contradiction with Jeremiah 2:22
While 1 John 1:7 states that the blood of Jesus cleanses us from all sin, Jeremiah 2:22 suggests that no matter how one washes themselves, their iniquity is marked before God, indicating a contradiction in the extent or nature of cleansing.
Jeremiah 2:22: For though thou wash thee with nitre, and take thee much soap, [yet] thine iniquity is marked before me, saith the Lord GOD.
Contradiction with Isaiah 64:6
1 John 1:7 emphasizes purification through Jesus' blood, but Isaiah 64:6 claims that all our righteousness is as filthy rags, implying that human attempts at purity are inherently flawed and not entirely cleansed.
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 Hebrews 10:4
1 John 1:7 speaks of sin being cleansed by Jesus’ blood, yet Hebrews 10:4 states it is impossible for the blood of bulls and goats to take away sins, hinting at limitations in sacrificial blood for removing sin which might question the sufficiency when interpreted beyond its new covenant focus.
Hebrews 10:4: For [it is] not possible that the blood of bulls and of goats should take away sins.
Contradiction with Matthew 7:21-23
1 John 1:7 highlights the cleansing power of Jesus' blood, while Matthew 7:21-23 shows that not everyone who acknowledges Jesus will be accepted, as many are turned away despite their appeals, suggesting potential barriers to cleansing or acceptance beyond belief in his name.
Matthew 7:21-23: Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.