Lucifer was the third highest being in heaven

But there was one that chose to pervert this freedom. Sin originated with him who, next to Christ, had been most honored of God and who stood highest in power and glory among the inhabitants of heaven. Before his fall, Lucifer was first of the covering cherubs, holy and undefiled. “Thus saith the Lord God; Thou sealest up the sum, full of wisdom, and perfect in beauty. Thou hast been in Eden the garden of God; every precious stone was thy covering.... Thou art the anointed cherub that covereth; and I have set thee so: thou wast upon the holy mountain of God; thou hast walked up and down in the midst of the stones of fire. Thou wast perfect in thy ways from the day that thou wast created, till iniquity was found in thee.” Ezekiel 28:12-15.       The great controversy page 493