Where is that "written"? Chapter, verse? Please.
One only needs to study the Greek words to understand that the translation "will be bound" is in error. The Greek word is eimi which means I am, exist. Here is the word used again.
John 8:58 Jesus said unto them, Verily, verily, I say unto you, Before Abraham was, I am.
Jesus exists eternally as do the things the apostles were to bind. Nothing in that passage says that the what the apostles did would begin to be bound in heaven. They could only declare what already existed.