“How art thou fallen from heaven
O day-star, son of the morning! (Helel ben Shahar)
How art thou cast down to the ground,
That didst cast lots over the nations!
And thou saidst in thy heart:
‘I will ascend into heaven,
Above the stars of God (El)
Will I exalt my throne;
And I will sit upon the mount of meeting,
In the uttermost parts of the north;
I will ascend above the heights of the clouds;
I will be like the Most High (Elyon).’
Yet thou shalt be brought dow to the nether-world,
To the uttermost parts of the pit.”
– Isaiah 14:12-15
This is the only passage in the bible that mentions Lucifer. In Christian tradition, this passage is proof for the fall of Lucifer.

However, it is more probable that this passage is an allusion to a Canaantie or Phoenician myth about how Helel, son of the god Shahar, sought the throne of the chief god and was cast down into the abyss because of this. Evidence for this theory comes from an Ugaritic poem about two divine children, Shachar (dawn) and Shalim (dusk), who were born as the result of the intercourse of the god El with mortal women. That would make El, Elyon, and Shahar members of the Canaanite pantheon and the “mount of meeting” is the abode of the gods, which corresponds to Mount Olympus in Greek mythology. Unfortunately, this is just speculation as archaeologists have not uncovered any Canaanite sources that describe Helel ben Shahar or a revolt against Elyon.

Many Apocalyptic writers interpreted this passage as referring to Lucifer, and wrote about the fall of the angels. 1 Enoch refers to the falling angels as stars (see the watchers) and may be the beginning of the overlap between the story of the watchers and Isaiah.