The works of the great paytan Yannai were, with the exception of a small handful of poems, almost completely lost until their rediscovery in the Cairo Geniza. This poem, an acrostic comparison of the days of Moses and Jeremiah, was written by Yannai to serve as part of the Musaf Ḳedushah on the first Shabbat after 17 Tammuz, on which the opening section of Jeremiah is recited. It bears structural and linguistic similarities to the later famous ḳinah Esh Tuqad. In its liturgical context, it was intended to introduce the final few verses of the Ḳedushah . Nowadays the custom of poetic inserts into the ḳedushah is nearly extinct, but the poem stands as a moving and powerful work nonetheless. . . .