On one occasion Amnon evasively asked to be given three days' time for consideration, but when he left the Archbishop's palace he immediately regretted even appearing to waver in his Jewish faith.
Amnon, rebuked for his failure to keep his promise, pleaded guilty, and said that his tongue should be amputated, because it had expressed a doubt as to the truth of Judaism.
Three days later he appeared to Rabbi Kalonymus (died 1096) in a dream, taught him the prayer, and asked him to spread it throughout all Jewry.
The Russian poet Semyon Frug adapted it into an epic; and Schakschansky wove it into a drama in Yiddish.
Maskileison, p. 218, where older sources are quoted Heidenheim's edition of the Mahzor, introduction, where an alphabetical index of the liturgical poets is given; Landshuth, 'Ammude ha-'Abodah, 1857, i.