What is the source of this quote testifying Mary's assumption?

In the article, [The Assumption of Mary: A Belief since Apostolic Times](https://www.ewtn.com/library/answers/aofmary.htm) of EWTN it states: >At the Council of Chalcedon in 451, when bishops from throughout the Mediterranean world gathered in Constantinople, Emperor Marcian asked the Patriarch of Jerusalem to bring the relics of Mary to Constantinople to be enshrined in the capitol. The patriarch explained to the emperor that there were no relics of Mary in Jerusalem, that **"Mary had died in the presence of the apostles; but her tomb, when opened later . . . was found empty and so the apostles concluded that the body was taken up into heaven."** What is the source of this spurious quote?