Contradiction with Matthew 13:58
This verse explains that Jesus did not perform many miracles in Nazareth because of their unbelief, which contradicts Matthew 8:15 where a miracle is performed without mention of any belief requirement.
Matthew 13:58: And he did not many mighty works there because of their unbelief.
Contradiction with Mark 6:5-6
These verses state that Jesus could do no mighty work in Nazareth except heal a few sick people due to unbelief, contrasting with the unimpeded healing miracle in Matthew 8:15.
Mark 6:5-6: And he could there do no mighty work, save that he laid his hands upon a few sick folk, and healed [them].
Contradiction with John 4:48
Jesus states that people will not believe unless they see signs and wonders, which goes against the straightforward and unquestioned miracle performed in Matthew 8:15 without any emphasis on belief.
John 4:48: Then said Jesus unto him, Except ye see signs and wonders, ye will not believe.
Contradiction with Matthew 12:38-39
Jesus reprimands those seeking signs, yet in Matthew 8:15, He performs a healing, appearing as if a sign is provided without objection or reprimand.
Matthew 12:38-39: Then certain of the scribes and of the Pharisees answered, saying, Master, we would see a sign from thee.