The Biblical account of Adam and Eve’s sin describes a serpent tempting Eve to disobey God. This serpent is understood to be Satan. (Revelation 12:9; 20:2) Satan is the originator of sin, but he was not created sinful. (Ezekiel 28:15) Satan was created perfect by God, and sometime after his creation he sinned. When did this happen?
The Bible does not give a definitive answer to this question, but Scripture does give a few indicators that help identify the time period in which Satan sinned. Ezekiel 28 says that Satan was in the Garden of Eden, was beautiful, was one of the cherubim surrounding God’s throne and was perfect until the day he sinned. Isaiah says Satan’s first sin was an arrogant desire to become greater than God. (Isaiah 14:12-14)
Satan’s sin must have taken place sometime after the sixth day of creation. Satan could not have fallen before the events described in Genesis 1 because the Bible says that God created all things in six days. (Exodus 20:11) The angels were most likely created on the first day of creation when God created Heaven and Earth, since the angels watched the creation of the earth from the beginning. (Job 38:7) Satan is an angel and must have been created at the same time as the rest of the angelic creatures.
Satan must have sinned after the six days of creation because Genesis 1:31 says that at the end of the sixth day, “God saw everything that He had made and behold it was very good.” Nothing in the context of Genesis 1 limits Genesis 1:31 to only the things God had made on the earth, or only the things in the garden of Eden. Genesis 1 starts with, “In the beginning God created the heaven and the earth,” and continues with an unbroken sequence of Divine creative acts in which God made all things. Therefore, everything in heaven and earth must be included in the evaluation, “very good.” A sinful, rebellious angel would not be considered by the Holy God to be “very good.”
Satan sinned sometime after the creation week and before the sin of Adam and Eve. The Bible does not tell how much time elapsed between creation and the fall. Some scholars think Adam may not have sinned until nearly 100 years after creation, because he fathered Seth at the age of 130 years. Cain and Abel were born after Adam and Eve sinned and then grew to adulthood before Cain killed Abel. After Abel’s murder and Cain’s exile Eve gave birth to Seth. Therefore, Adam could have been as old as 100 when they were kicked out of the Garden of Eden. The Bible does not tell how much time elapsed between Satan’s fall and the temptation of Adam and Eve. Satan’s rebellion against God could have been as late as 100 years after creation.
The fact that Lucifer ministered around the throne of God suggests that some time elapsed after creation before Satan sinned. He probably did not rebel on the 8th day of the world’s existence. Satan sinned sometime after the creation was completed but before Adam and Eve sinned. Satan was not created sinful, but in his pride he rebelled against his Creator.