On 16th February 1969 he became monk in Deir El-Sourian, and was named Toma El-Souriani (Thomas of Al-Sourian Monastery). Then against his will, he was [[ordination|ordained]] a priest on [[Palm Sunday ]] 1970, as he did not desire any priestly rank in the monastery. He was later ordained a [[hegumen ]] priest on 17th August 1972.

On 24th September 1972 he was enthroned against his will by [[Shenouda III (Gayyid) of Alexandria|His Holiness Pope Shenouda III]] as the [[Bishop]] of Damietta, Kafr El-Sheikh and the Monastery of Saint Demiana, Barrari, Belkas. On Sunday 2 September 1990 His Grace Bishop Bishoy was ordained elevated to the rank of Metropolitan in the [[Cathedral]] of Saint [[Athanasius the Great|Athanasius the Apostle]] in Damanhur, Egypt.