The Lives of the Saints from the Old and New Testaments (Polish: Żywoty świętych starego i nowego zakonu) is a hagiography by Polish Jesuit Piotr Skarga (written in 1577, first published in 1579). It became one of the most popular Polish books ever and a classic of Polish literature. It is one of two most famous works by Skarga, the other being Sejm Sermons.