Connection with J. S. Bach 
The Calov Bible was made famous with the discovery of a long-lost copy that had once belonged to the composer Johann Sebastian Bach. At the time of his death, the inventory of Bach's library specified ownership of Calovii Schriften (writings of Calovius). It was not known until the 20th century what these writings were.
In June 1934 a Lutheran minister, Christian G. Riedel, was attending a convention of the Missouri Synod in Frankenmuth, Michigan. While a guest in the home of his cousin, Leonard Reichle, pastor Riedel was shown a book in which he recognized Bach's signature on the frontispiece. Reichle subsequently located the other two volumes in his attic, relating that his family had purchased them in the 1830s, in Philadelphia. Reichle donated the three volumes to the Concordia Seminary Library in St. Louis, Missouri, in October 1938, and the Calov Bible is still there today. Only after the upheavals of World War II, however, did the bible become known to Bach scholarship.
The Calov Bible is in three volumes, each signed on its main title page by J. S. Bach, who followed his signature with the date, 1733. These contain 348 underlinings, marks of emphasis, and marginalia in Bach's hand, an attribution that has been proven by handwriting analysis and chemical analysis of the ink. In many instances Bach was correcting typographical or grammatical errors. Three of Bach's more important notations are in proximity to the following passages. (Biblical passages, hyperlinked to biblegateway.com, are followed by Bach's comments).