Contradiction with Matthew 5:16
John 1:39 suggests a private meeting, while Matthew 5:16 calls for public display of one's good works.
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 Matthew 16:20
John 1:39 involves following Jesus, but Matthew 16:20 instructs disciples to tell no one he is the Christ.
Matthew 16:20: Then charged he his disciples that they should tell no man that he was Jesus the Christ.
Contradiction with John 18:20
John 1:39 indicates a private conversation, whereas John 18:20 highlights Jesus speaking openly to the world.
John 18:20: Jesus answered him, I spake openly to the world; I ever taught in the synagogue, and in the temple, whither the Jews always resort; and in secret have I said nothing.
Contradiction with Mark 4:22
John 1:39 implies hidden events, while Mark 4:22 says nothing is hidden except to be revealed.
Mark 4:22: For there is nothing hid, which shall not be manifested; neither was any thing kept secret, but that it should come abroad.
Contradiction with Proverbs 27:2
John 1:39 involves directly inviting people, whereas Proverbs 27:2 suggests letting others, not oneself, praise one's actions.
Proverbs 27:2: Let another man praise thee, and not thine own mouth; a stranger, and not thine own lips.