Contradiction with Jonah 1:2-3
While Ezekiel 3:6 suggests that the people of a foreign speech would have listened, Jonah fled exactly to avoid delivering messages to Nineveh, a city with a foreign speech, because he feared they might repent and be spared.
Jonah 1:2-3: Arise, go to Nineveh, that great city, and cry against it; for their wickedness is come up before me.
Contradiction with Matthew 10:5-6
Ezekiel 3:6 implies a foreign audience would have received the message, while here, Jesus specifically instructs the disciples not to go to the Gentiles or Samaritans, focusing instead on the "lost sheep of Israel."
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:
Contradiction with Acts 13:46
Where Ezekiel 3:6 hints that a foreign nation might have been more receptive, Paul and Barnabas claim here that it was necessary to speak the word of God to the Jews first, but after their rejection, they turn to the Gentiles.
Acts 13:46: Then Paul and Barnabas waxed bold, and said, It was necessary that the word of God should first have been spoken to you: but seeing ye put it from you, and judge yourselves unworthy of everlasting life, lo, we turn to the Gentiles.
Contradiction with John 1:11
Ezekiel 3:6 implies foreigners would listen, whereas here, it is mentioned that Jesus came unto his own, who did not receive him, unlike the implicit foreign contrast.
John 1:11: He came unto his own, and his own received him not.
Contradiction with Mark 6:11
Ezekiel 3:6 suggests foreigners would listen, yet Mark describes how entire towns may reject the message regardless of the audience's background, implying rejection isn't unique to one's native people.
Mark 6:11: And whosoever shall not receive you, nor hear you, when ye depart thence, shake off the dust under your feet for a testimony against them. Verily I say unto you, It shall be more tolerable for Sodom and Gomorrha in the day of judgment, than for that city. [and: Gr. or]