Longer Catechism (Orthodox) 5.157

Chapter 5 — Part I — Article III (Of the Incarnation)

Section 157. Q. Whence is sin in men, seeing that they were created in the image of God, and God can not sin? A. From the devil. He that committeth sin is of the devil; for the devil sinneth from the beginning. 1 John iii. 8.