Contradiction with Matthew 15:24
Jesus states he was sent only to the lost sheep of the house of Israel, contradicting the inclusion of Gentiles.
Matthew 15:24: But he answered and said, I am not sent but unto the lost sheep of the house of Israel.
Contradiction with Acts 10:28
Peter himself says it is unlawful for a Jew to associate with or visit a Gentile, contradicting Cornelius being described as just.
Acts 10:28: And he said unto them, Ye know how that it is an unlawful thing for a man that is a Jew to keep company, or come unto one of another nation; but God hath shewed me that I should not call any man common or unclean.
Contradiction with Galatians 2:12
Paul mentions Peter withdrew from eating with Gentiles, which contradicts the acceptance of Cornelius in Acts 10:22.
Galatians 2:12: For before that certain came from James, he did eat with the Gentiles: but when they were come, he withdrew and separated himself, fearing them which were of the circumcision.
Contradiction with Deuteronomy 7:2-3
Israelites are commanded not to make covenants with or intermarry Gentile nations, which contradicts Cornelius' favorable standing.
Deuteronomy 7:2-3: And when the LORD thy God shall deliver them before thee; thou shalt smite them, [and] utterly destroy them; thou shalt make no covenant with them, nor shew mercy unto them:
Contradiction with Ezekiel 44:9
Foreigners, including uncircumcised Gentiles, are not allowed in God's sanctuary, which contradicts the favor shown to Cornelius.
Ezekiel 44:9: Thus saith the Lord GOD; No stranger, uncircumcised in heart, nor uncircumcised in flesh, shall enter into my sanctuary, of any stranger that [is] among the children of Israel.
Contradiction with Matthew 10:5-6
Jesus instructs his disciples to go only to the lost sheep of Israel, not Gentiles, which contradicts Cornelius' reception.
Matthew 10:5-6: These twelve Jesus sent forth, and commanded them, saying, Go not into the way of the Gentiles, and into [any] city of the Samaritans enter ye not: