"A prayer book is a book containing prayers and perhaps devotional readings, for private or communal use, or in some cases, outlining the liturgy of religious ...
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services. Books containing mainly orders of religious services, or readings for them are termed "service books" or "liturgical books", and are thus not prayer-books in the strictest sense, but the term is often used very loosely. Breviaries are prayer books used in many Christian denominations by believers to pray at fixed prayer times the canonical hours seven times a day, a practice that has its roots in Psalm 118:164. Throughout the year, and especially during certain seasons of the Christian liturgical kalendar such as Advent and Lent, many Christians pray a daily devotional, which contains a prayer for each day along with a reflection on a passage from the Christian Bible. A religion´s scriptures might also be considered prayer books as well." - (en.wikipedia.org 04.11.2021)
