Forty Hours' Devotion, also called Quarant' Ore or written in one word Quarantore, is a Roman Catholic exercise of devotion in which continuous prayer is made for forty hours before the Blessed Sacrament exposed. It commonly occurs in a succession of churches, with one finishing prayers at the same time as the next takes it up. A celebration of such a devotion is begun by a Solemn Mass or "Mass of Exposition", and ended by a "Mass of Deposition". Each of these masses includes the Blessed Sacrament being processed and the litanies of the saints being chanted.