Where can I find Calvin's commentary on the Hebrew Bible in the original Latin? Where can I find Calvin's commentary on the Hebrew Bible in the original Latin? I am looking to find his comments on Genesis 12.
The Post-Reformation Digital Library is the best place I've found for these sorts of documents.  And, sure enough, a search for "Calvin" and "Genesis" includes the following results:


In Primum Mosis Libru[m], qui Genesis vulgo dicitur, Commentarius Iohannis Calvini, 1554, page 84
Commentarii Ioannis Caluini in quinque libros Mosis, Genesis seorsum reliqui quatuor in formam harmoniae digesti, 2ed, 1573, page 96


The page numbers indicate where, according to the book's internal pagination, the commentary on Genesis 12 begins.