St. Cyril of Jerusalem, Doctor of the Church (4th Century): First Catechetical Lecture Of Our Holy Father Cyril, Archbishop of Jerusalem, To Those Who Are to Be Enlightened, Delivered Extempore at Jerusalem, As an Introductory Lecture To Those Who Had Come Forward for Baptism, Lecture III on Baptism: "If any man receive not Baptism, he hath not salvation; except only Martyrs, who even without the water receive the kingdom. For when the Saviour, in redeeming the world by His Cross, was pierced in the side, He shed forth blood and water; that men, living in times of peace, might be baptized in water, and, in times of persecution, in their own blood. For martyrdom also the Saviour is wont to call a baptism, saying, Can ye drink rite cup which I drink, and be baptized with the baptism that I am baptized with?
Lecture XIII: "For since in the Gospels the power of salutary Baptism is twofold, one which is granted by means of water to the illuminated, and a second to holy martyrs, in persecutions, through their own blood, there came out of that saving Side blood and water, to confirm the grace of the confession made for Christ, whether in baptism, or on occasions of martyrdom."