Yishtabach

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In the shacharit service, the short yishtabach (ישתבח) prayer is the final portion of the Pesukei D'Zimrah ("verses of praise"), recited before the second kaddish leading to the Shema. The theme of fifteen plays a pivotal role in the blessing; there are fifteen expressions conveying praise in the beginning half of the paragraph and fifteen words after the concluding 'ברוך אתה ה. The number fifteen is an allusion both to the Divine Name יה (with a Gematria of fifteen) and to the fifteen Song of Ascents composed by King David.