This article argues that the term “holy” (saint/sainte) was a key word in the French revolutionary lexicon during the Terror. Its use was comparable in frequency to the terms “glorious” and “useful”. Among the many things revolutionaries regarded as “holy”—for example, liberty, equality, the constitution, the laws, and the revolution itself—by far the most often cited was the “Mountain”. Historians have assumed that “Montagne” simply referred to the deputies who occupied the upper benches in the National Convention, but an analysis of the term “holy Mountain” shows that the real significance of the name came from its analogy to Mount Sinai. Revolutionaries venerated the Mountain as a source of divine laws and as a force with the godlike capacity to punish “impious” enemies. The concept indicates an authentic religiosity among the revolutionaries, who are otherwise seen as heirs to the Enlightenment, and therefore questions the traditional opposition between Enlightenment and religion.