Contradiction with Matthew 5:16
Contradicts by urging believers to let their light shine before others, while Matthew 9:30 records Jesus instructing healed individuals to keep silent.
Matthew 5:16: Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven.
Contradiction with John 7:4
Contradicts by noting that those seeking to be known do not act in secret, while Matthew 9:30 shows Jesus asking for discretion.
John 7:4: For [there is] no man [that] doeth any thing in secret, and he himself seeketh to be known openly. If thou do these things, shew thyself to the world.
Contradiction with Mark 5:19
Contradicts as Jesus instructs a healed man to go and tell others, whereas Matthew 9:30 advises silence.
Mark 5:19: Howbeit Jesus suffered him not, but saith unto him, Go home to thy friends, and tell them how great things the Lord hath done for thee, and hath had compassion on thee.
Contradiction with Luke 8:39
Contradicts because Jesus tells a man to return home and declare what God has done, opposed to the command for silence in Matthew 9:30.
Luke 8:39: Return to thine own house, and shew how great things God hath done unto thee. And he went his way, and published throughout the whole city how great things Jesus had done unto him.