This is proof that we are not to take everything that has been handed down to us as a teaching from the church, or the church fathers, or from "Biblical scholars" to be scriptural. We are to test all things by the scripture. The verses responsible for this errant assumption that Lucifer was Satan's former name is given here. Isaiah 14:12 How art thou fallen from heaven, O Lucifer, son of the morning! how art thou cut down to the ground, which didst weaken the nations! 13 For thou hast said in thine heart, I will ascend into heaven, I will exalt my throne above the stars of God: I will sit also upon the mount of the congregation, in the sides of the north: 14 I will ascend above the heights of the clouds; I will be like the most High. 15 Yet thou shalt be brought down to hell, to the sides of the pit. 16 They that see thee shall narrowly look upon thee, and consider thee, saying, Is this the man that made the earth to tremble, that did shake kingdoms; 17 That made the world as a wilderness, and destroyed the cities thereof; that opened not the house of his prisoners? 18 All the kings of the nations, even all of them, lie in glory, every one in his own house. 19 But thou art cast out of thy grave like an abominable branch, and as the raiment of those that are slain, thrust through with a sword, that go down to the stones of the pit; as a carcase trodden under feet. 20 Thou shalt not be joined with them in burial, because thou hast destroyed thy land, and slain thy people: the seed of evildoers shall never be renowned. To put this in context: the above is actually a proverb being given to the king of Babylon. Isaiah 14:4 That thou shalt take up this proverb against the king of Babylon, and say, How hath the oppressor ceased! the golden city ceased! Everything that is written in context is regarding that king of Babylon. It testifies to that king that he will die, but worse than any other famous king on earth because he will not be given a grave to be remembered by. Now there is no way that is being attributed to Satan at all. http://www.sacrednamebible.com/kjvstrongs/B23C014.htm At the link above is Strong's Concordance to Isaiah 14th chapter. If you click on heaven in verse 12, we will find this text: "shamayim" with this meaning: So this fall isn't from God's abode, but the sky where the stars are at. All the words in that quoted part of the proverb is referring to the sky as the location as described in verse 13 above. If you click on "Lucifer" in verse 12, we will find this text "heylel" with this meaning: One can say that Lucifer was a reference to the planet Venus which is a fixed star that can be seen in the morning. The naming of that star would probably be the same thee way we name the "North Star". Anyway, the reference is symbolic to the lofty evil boastings that the king of Babylon was making of himself from which he will and did fall from such lofty and vain grandeur. This is proof that we are not to take everything that has been handed down to us as a teaching from the church, or the church fathers, or from "Biblical scholars" to be scriptural. We are to test all things by the scripture. So do take this as a prompting from the Lord to not accept everything your church has taught you in blind faith or what general trivia going around in the world is telling us at face value. Lucifer was not Satan's former name when it was from a proverb addressing the king of Babylon, and it was because of his evil boastings which he had made known to mankind and thus to God for God to respond that caused the king of Babylon to fall from. This is the reason why believers should test and prove all things taught to them by the "Biblical scholars". This false teaching of Lucifer being Satan's former name would not have gotten far if believers actually had read that in context, seeing it as a proverb to the king of Babylon.