The duties of a subdeacon are to serve the deacon at Mass; to prepare the bread and wine and sacred vessels for the Holy Sacrifice; to present the chalice and paten at the Offertory, and pour water into the wine for the Eucharist; to chant the Epistles solemnly; to wash the sacred linen. In the Greek Church, subdeacons prepare the chalice at the prothesis and guard the gates of the sanctuary during the Holy Sacrifice. In the ancient Roman Church, the subdeacons administered in great part the temporal goods of the Holy See and were often employed on important missions by the popes. A candidate for the subdiaconate must have been confirmed and have received minor orders. He must have the knowledge befitting his grade in the Church and have entered on his twenty-second year. He must also have acquired a title to orders. After ordination, he is bound to celibacy and to the recitation of the Divine Office.