Book of Deggua
The Book of Deggua (Ge'ez: መፅሃፈ ድጓ, romanized: mes’hafe dəgwa "Book of Lamentation") is a hymnbook used in the Ethiopian and Eritrean Orthodox Tewahedo Churches. It was developed by the 6th-century composer Yared. The great Deggua is called Mahlete Yared (treasury).
Yared prepared Deggua in three modes of chanting used by the church, Ge'ez, Ezil and Araray, represent the Trinity: God the Father, God the Son and the Holy Spirit, respectively. Ge'ez is plain chant for ordinary days, Ezil 'measured' is for funerals, and Araray 'lighter' is a free mode for great festivals.
The Degwa contains many passages from the Genesis creation narrative, patristic works, hagiographies, homilies, etc.