The Book of Tobit
Tobit is one of the deuterocanonical books which are included in the Roman Catholic and Eastern Orthodox canon, and not included in the Jewish and most Protestant Canons. It was one of the seven books stricken by Martin Luther, probably for the reason that it was not included by the Jews as part of the Scriptures in their own Canon. Its absence from the Jewish Tanakh was for a long time ascribed to erroneous reasoning.
Until 1952 scholars believed that Tobit, as well as the other six Old Testament books absent from the Jewish Canon, were excluded because they had not originally been written in Hebrew. The discovery of scrolls and fragments of all seven of the excluded books among the Dead Sea Scrolls ended this theory. Further theory regarding Tobit assigned its exclusion to its late authorship, but the Dead Sea Scrolls demonstrated that theory to be incorrect as well. The fragments revealed that the Book of Tobit was at least as old as the Book of Daniel, perhaps even older.
The book itself praises the sanctity of marriage and is often used in weddings. The angel Raphael figures prominently in the book, leading it to be cited as supporting the doctrine of angelic intercession in earthly affairs. It includes references to Mosaic Law and quotes from the Book of Amos, which places its authorship after those, and the first two chapters are written in the first person, although the actual authorship is unknown. It is often cited for its support of the value of humble prayer, charitable giving, and fasting.
So why was it excluded from the Jewish Canon, which led to its exclusion by Martin Luther, which led to its exclusion in most Protestant religions? It may be that a verse it contains which refers to a wedding describes the father of the bride writing the marriage certificate, in violation of a rabbinical law which requires that the marriage document be written by the bridegroom. Despite this there has been a drive in recent years for the Book of Tobit to be included in the Jewish Canon.
What a change to the Jewish Canon in which Tobit is included would do to its status with Protestant religions is a matter of conjecture. While the versions found to have been written in Aramaic and Hebrew are fragmented there are two differing versions in Greek, one much longer than the other. The majority of the Latin and English translations of the Book of Tobit are from the longer of the two Greek versions of the book.