A Yasht (Middle Persian: 𐭩𐭱𐭲, yšt') is a hymn of praise in the Avestan language dedicated to a specific Zoroastrian divinity.
The English word yasht is derived from Middle Persian 𐭩𐭱𐭲 (yšt', "prayer, worship").
[1] All the hymns of the Yasht collection "are written in what appears to be prose, but which, for a large part, may originally have been a (basically) eight-syllable verse, oscillating between four and thirteen syllables, and most often between seven and nine.
The can be recited by priests as well as lay people and in a diverse range of settings, like fire temples as well as in private or public spaces.
Their liturgical use is, therefore, different from the high liturgies, like the Yasna, Vendidad or Visperad, which are always performed by several priests in a fire temple and are addressed to all Zoroastrian divinities.