In Ezekiel 28:12-17 is a description of Satan before his fall, and during his fall. Ezekiel is speaking to the King of Tyre in the passage, but when you really look at the verses you see he is talking to Satan. The evidence for this is the fact taht the passage refers to a perfectly created, beautiful, wise creature that walked the mountain of God, and walked in Eden who was created as the guardian cherub. This cherub became so prideful that they were cast from heaven to earth.
The whole passage reads (NIV):
"You were the model of perfection, full of wisdom, and perfect in beauty. 13 You were in Eden, the garden of God; every precious stone adorned you' ruby, topas, and emerald, chrysolite, onyx, and jasper. Your settings and mountings were made of gold; on the day you were created they were prepared. 14 You were annointed as a guardian cherub, for so I ordained you. You were on the holy mount of God; you walked among the fiery stones. 15 You were blameless in your ways from the day you were created 'till wickedness was found in you. 16 16 Through your widespread trade you were filled with violence, and you sinned. So I drove you in disgrace from the mount of God, and I expelled you, O guardian cherub, from among the firey stones. 17 Your heart became proud on account of your beauty, and you corrupted your wisdom because of your splendor. So I threw you to the earth; I made a spectacle of you before kings."
Isaiah 14:12-15 also seems to be talking about the fall of Satan.
"How you have fallen from heaven, O morning star, son of the dawn! You have been cast down to the earth, you who once laid low the nations! 13 You said in your heart, "I will ascend to heaven; I will raise my throne above the stars of God; I will sit enthroned on the mount of assembly, on the utmost heights of the sacred mountain. 14 I will ascend above the tops of the clouds. I will make myself like the Most High." 15 But you are brought down to the grave, to the depths of the pit."
Revelation 12:4 seems to support the view that Ezekiel and Isaiah are talking about Satan.
"His tail swept a third of the stars out of the sky and flung them to the earth."