Martin Tanner explains that the Jewish sect that wrote the Dead Sea Scrolls was called the "Latter-day Saints" and were led by a "Teacher of RIghteousness" and a counsel of 10 to 12 men.  The Dead Sea Scrolls confirm many truths from the Book of Mormon, that there were ancient Jewish prophets not mentioned in the Bible, like Zenock and Zenos in the Book of Mormon, and Zadock in the Dead Sea Scrolls. They confirm pre-Christian Jews practiced baptism by immersion.  They believed their Messiah would be pierced and die.  The Nag Hammadi Library is noteworthy because it has authentic words of Jesus, not in the Bible, its Gospel of Philip implies Jesus was married to Mary Magdalene, and it speaks of a Heavenly Mother.  The Secret Gospel of Mark says Jesus taught Lazarus, after bringing him back from the dead, about the "mysteries of the Kingdom of God" in a which which appears to be very much like the LDS Temple Endowment.