Sacrament of Holy Orders

Holy Orders is the sacrament through which the mission entrusted by Christ to his apostles continues to be exercised in the Church until the end of time: thus it is the sacrament of apostolic ministry. It includes three degrees: episcopate, presbyterate, and diaconate.
Catechism of the Catholic Church 1536

As he passed by the Sea of Galilee He saw Simon and his brother Andrew casting their nets into the sea; they were fishermen. Jesus said to them, “Come after me, and I will make you fishers of men.” And they left their nets and followed Him. (Mark 1:16-18)