No, you didn't. Paul was talking about what THEY the apostles taught. In no way did the link you posted show that the apostles taught the assumption of Mary.
you wrote: Please show where the teaching included the assumption of Mary and the requirement to believe it.
I posted a link to that teaching. http://w2.vatican.va/content/pius-xii/en/apost_constitutions/documents/hf_p-xii_apc_19501101_munificentissimus-deus.html
Deny it all you want, but there it is.