the "shehechayanu" blessing marking the commencing of Yom tov and other special joyous occasions e.g building a new house birth

The "blessing" (short prayer) ברוך... שהחינו וקימנו והגיענו לזמן הזה, said on special occasions, specifically on fulfilling various once-in-a-long-while commands, on certain holidays, and at certain happy circumstances.

http://en.wikipedia.org/wiki/Shehecheyanu

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