三さん歌か斎さい経けい

Meanings

1

Triodion; Lenten Triodion

work of art, literature, music, etc.

A liturgical book used in Eastern Orthodox and Eastern Catholic traditions during the pre-Lenten and Lenten seasons.

三さん歌か斎さい経けいは、東とう方ほう正せい教きょう会かいの大だい斎さいの準じゅん備び期き間かんに用もちいられる典てん礼れい書しょです。
The Triodion is a liturgical book used during the preparatory period for Great Lent in the Eastern Orthodox Church.