Question: what are lost books of the bible?
Answer: The Protevangelion.
The Gospel of the Infancy of Jesus Christ.
The Infancy Gospel of Thomas.
The Epistles of Jesus Christ and Abgarus King of Edessa.
The Gospel of Nicodemus (Acts of Pilate)
The Apostles' Creed (throughout history)
The Epistle of Paul the Apostle to the Laodiceans.