Contradiction with Matthew 5:44
Matthew 10:12 speaks about greeting a house with peace, but Matthew 5:44 instructs to love and bless even enemies, extending beyond just specific greetings.
Matthew 5:44: But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;
Contradiction with Luke 10:10-11
This verse involves leaving a city for not receiving the message, which contrasts with greeting a house with peace as in Matthew 10:12.
Luke 10:10-11: But into whatsoever city ye enter, and they receive you not, go your ways out into the streets of the same, and say,
Contradiction with 2 John 1:10
This verse advises against greeting those who do not bring specific doctrine, contrasting with the idea of offering peace in Matthew 10:12.
2 John 1:10: If there come any unto you, and bring not this doctrine, receive him not into [your] house, neither bid him God speed: