Why does the Bible use 'morning star' to refer to both Jesus and Satan?

from the old testament

• Isaiah 14:12 says, “How you are fallen from heaven, O Day Star, son of Dawn! How you are cut down to the ground, you who laid the nations low!” The phrase “day star” is similar in concept to the New Testament’s reference to Jesus as the “morning star.” However, Isaiah uses these words to taunt the king of Babylon (Isaiah 14:4). The immediate context is a judgment oracle in which God promises to bring down a proud ruler who exalted himself as if he were untouchable. The language is highly poetic, describing the downfall of a king who seemed impossibly high but was suddenly ruined by the LORD.
• Many Christians see a secondary reference to Satan because the king’s pride is described in exaggerated, cosmic terms. For example, later in the chapter, the king claims he will “ascend to heaven,” “raise [his] throne above the stars of God,” and “make [himself] like the Most High” (Isaiah 14:13–14). This language mirrors Satan’s revolt. This is why the King James Version translated Isaiah 14:12 as, “How art thou fallen from heaven, O Lucifer, son of the morning!” The word “lucifer” was a Latin word which didn’t mean “Satan,” but “light-bearer” or “morning star.” However, “lucifer” came to mean Satan in popular culture because of this translation and the passage’s potential indirect reference to Satan.

from the new testament

• Revelation 22:16 says, “I, Jesus, have sent my angel to testify to you about these things for the churches. I am the root and the descendant of David, the bright morning star.” Jesus is portrayed as the victorious King who brings God’s final salvation. In the ancient world, the morning star signaled that night was ending and light was coming. By using this image, Jesus assures believers that He brings God’s promised kingdom, fulfills the hope given to David, and ushers in the final day of redemption. The image is entirely positive and meant to highlight His glory.
• Images in Scripture work by comparing one thing to another, and the same picture can serve different purposes depending on how it is used. Consider the image of a lion that is used both for Satan and Jesus. Peter describes Satan as “a roaring lion, seeking someone to devour” (1 Peter 5:8). Peter’s use of that imagery emphasized Satan’s threat and hostility toward believers. Conversely, in Revelation 5:5, Jesus is called “the Lion of the tribe of Judah,” a title that presents Him as the powerful and victorious King who secures redemption. The same creature illustrates two very different realities: destructive power in Satan’s case and royal, saving power in Christ’s.

implications for today

A stoplight can signal safety or frustration depending on whether you’re in a hurry or crossing the street. Context matters. This truth applies to images in the Bible, such as the star imagery used by both Isaiah and the apostle John.

Rather than reading into Scripture what isn’t there, we must always keep the context in mind. Isaiah’s picture of a fading star refers to the pride of the king of Babylon who tried to lift himself above God. Even if Satan is read into that passage (because of the KJV translation), the image Isaiah depicts is very different from the hope-filled vision of Christ in Revelation 22:16.

Such misinterpretations are why reading a single Bible verse or building a doctrine out of a verse can be dangerous. Cults build heretical teachings on this very practice. Believers must remember that every verse has a context, and familiarizing ourselves with that context can help us avoid falling into heretical teachings and making connections that don’t really exist.