After the establishment of the Inquisition in 1478, observance of crypto-Judaism became dangerous and more difficult. Women were at the center of Judaizing efforts, since the home was the only remaining institution in which one could observe Jewish law. Crypto-Jewish women most frequently observed the Sabbath and dietary laws.

Sarah bas Tovim was an elusive figure, and the difficulty of documenting her life has led to doubts about her very existence. She is the author, or more precisely the composer, of two works published in the eighteenth century: Tkhine shaar ha-yikhed al oylemes (The Tkhine of the Gate of Unification concerning the Aeons) and Tkhine shloyshe sheorim (The Tkhine of Three Gates).