The purpose of the paper is foremost to present Andrey Muraviev’s approach to fasting, both in his personal life and in literary work. The main basis of the analysis are the memories of the writer and his Letters about the service of the Eastern Catholic [Orthodox] Church (Письма о Богослужении Восточной Кафолической Церкви). Attention is paid to the Slavic word post ‘fast’, to its etymology, sense, its equivalents in biblical languages, i.e. in Hebrew and Greek as well. The writer’s considerations for fasting are confronted with appropriate biblical comments on this topic. The paper emphasizes that Muraviev, despite being brought up in a religious spirit, in his childhood and youth was not used to following the restraints of fasting. Only ...