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. – CCC 1536

[A]nd they chose Stephen, a man who was full of faith and of the Holy Spirit, Philip, Prochorus, Nicanor, Timon, Parmenas, and Nicolas, who was a proselyte from Antioch. These they presented to the apostles, who laid their hands on them with prayer.
Acts of the Apostles 6:5-6