Contradiction with Exodus 20:3
John 9:38 describes an act of worship towards Jesus, while Exodus 20:3 commands that no other gods should be worshiped.
Exodus 20:3: Thou shalt have no other gods before me.
Contradiction with Isaiah 45:5
John 9:38 shows the man worshiping Jesus, whereas Isaiah 45:5 declares that there is no God besides the Lord.
Isaiah 45:5: I [am] the LORD, and [there is] none else, [there is] no God beside me: I girded thee, though thou hast not known me:
Contradiction with Matthew 4:10
John 9:38 includes worship of Jesus, yet Matthew 4:10 indicates that only God should be worshiped.
Matthew 4:10: Then saith Jesus unto him, Get thee hence, Satan: for it is written, Thou shalt worship the Lord thy God, and him only shalt thou serve.