The remaining writings which have been compiled or been recognised by heretics or schismatics the Catholic and Apostolic Roman Church does not in any way receive; of these we have thought it right to cite below some which have been handed down and which are to be avoided by catholics.60
In the list of apocryphal writings which are to be rejected Gelasius signifies the following work: Liber qui apellatur Transitus, id est Assumptio Sanctae Mariae, Apocryphus (Pope Gelasius 1, Epistle 42, Migne Series, M.P.L. vol. 59, Col. 162). This specifically means the Transitus writing of the assumption of Mary. At the end of the decree he states that this and all the other listed literature is heretical and that their authors and teachings and all who adhere to them are condemned and placed under eternal anathema which is indissoluble. And he places the Transitus literature in the same category as the heretics and writings of Arius, Simon Magus, Marcion, Apollinaris, Valentinus and Pelagius.62
Pope Gelasius explicitly condemns the authors as well as their writings and the teachings which they promote and all who follow them. And significantly, this entire decree and its condemnation was reaffirmed by Pope Hormisdas in the sixth century around A.D. 520.63 These facts prove that the early Church viewed the assumption teaching, not as a legitimate expression of the pious belief of the faithful but as a heresy worthy of condemnation. There are those who question the authority of the so-called Gelasian decree on historical grounds saying that it is spuriously attributed to Gelasius. However, the Roman Catholic authorities Denzinger, Charles Joseph Hefele, W. A. Jurgens and the New Catholic Encyclopedia64 all affirm that the decree derives from Pope Gelasius, and Pope Nicholas I in a letter to the bishops of Gaul (c. 865 A.D.) officially quotes from this decree and attributes its authorship to Gelasius. While the Gelasian decree may be questioned by some, the decree of Pope Hormisdas reaffirming the Gelasian decree in the early sixth century has not been questioned.
William Webster, Roman Catholic Tradition: Claims and Contradictions, p. 42-44