Contradiction with Ezekiel 18:24
This verse implies that if a righteous person turns away from righteousness, they will die, whereas Acts 3:19 suggests repentance leads to the blotting out of sins, offering a context of redemption even after sinning.
Ezekiel 18:24: But when the righteous turneth away from his righteousness, and committeth iniquity, [and] doeth according to all the abominations that the wicked [man] doeth, shall he live? All his righteousness that he hath done shall not be mentioned: in his trespass that he hath trespassed, and in his sin that he hath sinned, in them shall he die.
Contradiction with Hebrews 10:26
This verse suggests that if we continue to sin willfully after receiving the truth, there remains no more sacrifice for sins, seemingly contradicting the notion in Acts 3:19 that repentance can always lead to forgiveness.
Hebrews 10:26: For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins,
Contradiction with Matthew 12:31
This verse states that blasphemy against the Holy Ghost shall not be forgiven, contradicting the idea of all sins being blotted out upon repentance as suggested in Acts 3:19.
Matthew 12:31: Wherefore I say unto you, All manner of sin and blasphemy shall be forgiven unto men: but the blasphemy [against] the [Holy] Ghost shall not be forgiven unto men.
Contradiction with 1 John 5:16
This verse introduces the idea of a "sin unto death," which suggests that not all sins may be subject to forgiveness, contrasting with the absolute forgiveness implied in Acts 3:19 upon repentance.
1 John 5:16: If any man see his brother sin a sin [which is] not unto death, he shall ask, and he shall give him life for them that sin not unto death. There is a sin unto death: I do not say that he shall pray for it.