(Holiness of God – Evening Worship: Sanctification of God’s Name) The third blessing of the Shemoneh Esrei, the Kedusha blessing originated with mystics during the early rabbinic period. Mystical prayers and practices existed in which worshippers would attempt to ascend to heaven and come into the presence of God.
אַתָּה קָדוֹשׁ וְשִׁמְךָ קָדוֹשׁ וְּקדוֹשִׁים בְּכָל יוֹם יְהַלְלוּךָ סֶּלָה. בָּרוּךְ אָתָּה יְיָ הָאֵל הַקָּדוֹשׁ.
Atah kadosh v’shimcha kadosh uk’doshim b’chol yom y’hal’lucha, selah. Baruch atah Adonai, Ha-El hakadosh.
You are holy, Your Name is holy, and those who seek to become holy praise You. Blessed are You, Eternal God, the essence of holiness.