Contradiction with Deuteronomy 7:2
This verse instructs the Israelites to make no covenant with the nations and to show them no mercy, contrasting with Peter's willingness to associate with a Gentile in Acts 10:27.
Deuteronomy 7:2: 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 Ezra 9:12
It advises against mingling with foreign people for fear of corrupting the Israelites' heritage, unlike Peter entering the house of a Gentile in Acts 10:27.
Ezra 9:12: Now therefore give not your daughters unto their sons, neither take their daughters unto your sons, nor seek their peace or their wealth for ever: that ye may be strong, and eat the good of the land, and leave [it] for an inheritance to your children for ever.
Contradiction with Matthew 15:24
Jesus initially stated His message was only for the lost sheep of Israel, which contrasts with Peter's inclusive behavior towards Gentiles in Acts 10:27.
Matthew 15:24: But he answered and said, I am not sent but unto the lost sheep of the house of Israel.
Contradiction with John 4:9
Jews traditionally did not associate with Samaritans, highlighting a broader tradition of separation that Peter contradicts by associating with Gentiles in Acts 10:27.
John 4:9: Then saith the woman of Samaria unto him, How is it that thou, being a Jew, askest drink of me, which am a woman of Samaria? for the Jews have no dealings with the Samaritans.
Contradiction with Acts 11:2-3
Even other believers were initially upset with Peter for going to the Gentiles' home, which shows a contrast in the attitude of early Christians to Peter's actions in Acts 10:27.
Acts 11:2-3: And when Peter was come up to Jerusalem, they that were of the circumcision contended with him,