From Scripture. This answer is plainly backed by the text of Scripture.
Here is the short answer. Scripture never describes heavenly messengers as perfect. In some places it plainly describes their faults (2 Peter 2:4, Jude 1:6, Matthew 25:41). Satan was never a good heavenly messenger (John 8:44) who got jealous, wanted to be a god, and was then thrown out by God and sent to earth. That is a big myth. It comes from misreading Isaiah 14 and Ezekiel 28. Satan always had access to earth, and he could come before God (Job 1:6). He was only thrown out of heaven, and lost that access, after Yahushua went up to sit at the right hand of the Father (Revelation 12:5-10).
How can we prove that? First, let’s look at who Satan really is. Revelation 12:9 calls him “the great dragon… that old serpent… the Devil, and Satan”. So why is Lucifer left out? Because Lucifer is not, and never was, a name of Satan. It comes from the Hebrew word “Haylel,” which describes bringing light. Isaiah 14:12 describes a light bringer who fell from the heavens. Ezekiel 28:13-15 describes a perfect cherub, a heavenly being, who was in Eden and sinned against God. When people put those two passages together, they get the Lucifer myth.
Here is the problem, and the reason this does not describe Satan. Yahushua Himself told us Satan was never perfect. In John 8:44, He said Satan was a murderer from the beginning and never stood in the truth. Job is a second witness that Satan was made a liar. Job 26:13 talks about creation and says God’s “hand hath formed the crooked serpent”. Satan was a crooked liar from the beginning. He is very skilled at fooling people, but our God cannot be fooled. He would never have seen something He made “crooked” as perfect.
So who were Isaiah and Ezekiel talking about? That is the easy question. In Ezekiel 28:12, just one verse before the famous “Lucifer story” begins, we are told that the verses that follow are a lament, a sad song, for the king of Tyre. Ezekiel 28 has nothing to do with “Lucifer” or the Devil. It is a parable about the fall of the king of Tyre.
Ezekiel uses parables like this often. For example, Ezekiel 16 tells about a baby girl found in the land of Canaan. Her parents were an Amorite and a Hittite. She was cared for and spoiled. When she grew up, she married, but she cheated on her husband. In the end, all the lovers she cheated with turned on her. No one searches the Bible to find this girl’s name. Why? Because it is clear that Ezekiel 16 is a parable about Jerusalem, just as Ezekiel 28 is a parable about the king of Tyre.
The Word tells you plainly in Isaiah 14:4 that the verses that follow are a proverb, which means a parable, about the king of Babylon. Isaiah names Babylon again in Isaiah 14:22. If you look closely at the life of Nebuchadnezzar, the king of Babylon, you will see that Isaiah 14 fits him perfectly. Again, it was a parable.
Answered by Taught of Yah