The Theologico-Political Treatise (Latin: Tractatus Theologico-Politicus) by Baruch Spinoza is an analysis of the Hebrew Bible published anonymously in Latin in 1670. Intended to vindicate political freedom against encroachments based on religious authority, its interpretation owed much to contemporary Hobbesian political theory. While extremely controversial in its own day, it was an important influence on later biblical criticism.
Free online texts
Early Modern Texts: Treatise on Theology and Politics, adapted and translated into modern English, by Jonathan Bennett. PDF format.
Constitutional Society: Selected Political Works of Baruch de Spinoza. HTML and text formats.
Internet Archive: The Chief Works of Benedict de Spinoza, Vol I, translated by R.H.M Elwes. Multiple formats.
Internet Archive: Theologico-Political Treatise. Latin text. Multiple formats.
Spinoza et Nouse: Tractatus Theologico-Politicus. Latin text. HTML format.
Wikisource: Theologico-Political Treatise, translated by Robert Willis. HTML and other formats.
Wikisource: Theologico-Political Treatise, translated by R.H. Elwes. (Currently incomplete, with only first part transcribed). HTML and other formats.
Yesselman.com: Theologico-Political Treatise, translated by RH. Elwes. HTML format.
BBC Radio Great Lives: Benedict Spinoza. With Humphrey Carpenter and Sir Harry Kroto.
BBC Radio 4 In Our Time: Spinoza. Melvyn Bragg with Jonathan Rée, Sarah Hutton and John Cottingham.
Librivox: The Theologico-Political Treatise - public domain audiobook.
PhilPapers: Spinoza - bibliography with open source option.
Spinoza Gesellschaft: Spinoza Bibliography.
Further reading at Tom's Learning Note
Thomas Hobbes - Spinoza may have read Leviathan, and certainly read De Cive.