Longer Catechism (Orthodox) 7.212

Chapter 7 — Part I — Article V (Of the Resurrection)

Section 212. Q. What is the first proof and earnest given by Jesus Christ that his sufferings and death have wrought salvation for us men? A. This: that he rose again, and so laid the foundation for our like blessed resurrection. Now is Christ risen from the dead, and become the first-fruits of them that slept. 1 Cor. xv. 20.