17 May Revelation 12:9
9 And the great dragon was thrown down, the serpent of old who is called the devil and Satan, who deceives the whole world; he was thrown down to the earth, and his angels were thrown down with him.
Have you ever heard of demons? They are fallen angels. They were created by God, they lived in Heaven, but they chose to sin against God. Do you remember their boss or the one they followed in sin? You got it, he is known as Satan! He and all the demons were actually thrown out of Heaven because of their sin. From our studies in both the Old Testament and New, where have you seen or heard of Satan or his demons? (With Eve in the Garden of Eden, Jesus being tempted, etc.)