 Catholic priests are ordained by bishops through the sacrament of holy orders.The Catholic Church claims that Catholic bishops were ordained in an unbroken line of apostolic succession back to the Twelve Apostles depicted in the Catholic Bible.The ceremony of Eucharist, which Catholics believe can only be performed by priests, in particular derives from the story of the Last Supper, when Jesus Christ distributed bread and wine in the presence of the Twelve Apostles, in some versions of the Gospel of Luke commanding them to "do this in memory of me".