The first section discusses assumptions about the origin of Spinoza’s dictum Deus, sive Natura ‘God, or Nature’ under the influence of medieval Jewish sources. In particular Moshe Idel sees here the direct influence of the same gematria (86) of the terms ʾĔlōhîm ‘God’ and haṭ-ṭeḇaʿ ‘nature’ (by the root meaning, an ‘imprint’), which was doctrinally adapted in the concepts of some Jewish Kabbalists. The generalized image of “nature” / “universe” as an “imprint” (haṭ-ṭeḇaʿ), “imprinted” by ʾĔlōhîm, the “God”, has been used in a number of medieval Jewish creationist and emanational-emergent concepts to avoid identifying the Creator and His creation (the “Print” is not identical to its “imprint”), but it is fundamentally incompatible with Spinoza’s monistic-panentheistic doctrine. The second section deals with fragments from ancient sources recorded in the Thesaurus Ciceronianus and Adversus Mathematicos of Sextus Empiricus, in which 368 deus ‘god’ and natura ‘nature’ (also mundus ‘universe’) are directly identified; these fragments, in the author’s opinion, could have directly influenced the formation of Spinoza’s concept of Deus, sive Natura. In the Thesaurus Ciceronianus, the author identifies and analyzes relevant passages in the articles Deus (coll. 519-523), Natura (coll.1142-1146), and Xenophanes (col. 1898); a fragment of the Adversus Mathematicos (9.85) is also considered.