Shochen Ad

Shochen Ad, שׁוֹכֵן עַד (Translated as He Who abides forever or He Who dwells in eternity) is a prayer recited toward the end of Pesukei Dezimra during the Shacharit service of Shabbat and Yom Tov, and during the Passover Seder in the Ashkenazic tradition. It is based on the verse from the Book of Isaiah 57:15.

On Shabbat, Shochen Ad marks the beginning of the service for the chazzan of the Shacharit (following Pesukei Dezimra). This is a sign of God's creation of the world during the other six days of the week, followed by Shabbat being a day of rest. On the Shalosh regalim, the chazzan begins the service on the previous verse known as Hakel B'tzatzumot (part of Nishmat), signifying miracles God performed associated with these holidays. On the High Holidays, the chazzan begins on the word Hamelekh (המלך) within that verse, as during these days, an emphasis is placed on recognition of God as King. It is also described in Sefer HaChaim that loudly chanting the word Hamelekh has the effect of driving away accusers from the throne of judgement. Additionally, the letter ה is dropped off the word היושה, alluding to the fact that now God is sitting on the throne.