Sirach may have been used as a basis for two important parts of the Jewish liturgy. In the Mahzor (High Holiday prayer book), a medieval Jewish poet may have used Sirach as the basis for a poem, KeOhel HaNimtah, in the Yom Kippur musaf (“additional”) service for the High Holidays. However, some question whether this passage in Sirach is referring at all to Yom Kippur, and thus argue it cannot form the basis of this poem. Some early 20th Century scholars also argued that the vocabulary and framework used by Sirach formed the basis of the most important of all Jewish prayers, the Amidah, but that conclusion is disputed as well.