Barukh she'amar ( בָּרוּךְ שֶׁאָמַר, baruch sheamar, or other variant English spellings), is the opening blessing to pesukei dezimra.
The prominent version of Barukh sheamar contains 87 words. This is the
gematria of the Hebrew word paz (פז) meaning "refined gold.". An alternative text is printed in some  Sephardic prayer books, often alongside the traditional version.
Purpose [ edit ]
Barukh she'amar acts as a
transition in the prayer service. In the Syrian tradition, the common melody for the prayer is derived from that of Hatikvah. 
Saadya Gaon instituted the recitation of barukh she'amar for Shabbat, but in France, it became a custom to recite this prayer daily. 
Sephardic and Oriental liturgy, the custom is to recite all the additional psalms of Shabbat prior to Barukh sheamar on Shabbat. 
Aspects of God [ edit ]
There are seven aspects of
God mentioned in Barukh she'amar. These are: 
God spoke and the world came to be.
God speaks, does, decrees, and fulfills.
God is merciful.
God rewards those who fear Him.
God is eternal.
God rescues and redeems people.
Blessed is God's name.
References [ edit ]
^ Jewish liturgy and its development By Abraham Zebi Idelsohn, page 80
^ Maqām and liturgy: ritual, music, and aesthetics of Syrian Jews in Brooklyn By Mark L. Kligman, page 90
^ Jewish liturgy and its development By Abraham Zebi Idelsohn, page 81
^ The Jewish quarterly review, Volume 11 By Cyrus Adler, page 260
^ Every person's guide to Jewish prayer By Ronald H. Isaacs, page 113