Several verses from Psalm 51 are regular parts of Jewish liturgy. Verses (in Hebrew) 3, 4, 9, 13, 19, 20, and 21 are said in Selichot. Verses 9, 12, and 19 are said during "Tefillat Zakkah" prior to the Kol Nidrei service on Yom Kippur eve. Verse 17, "O Lord, open my lips", is recited as a preface to the Amidah in all prayer services. Verse 20 is said by Ashkenazi Jews before the removal of the Sefer Torah from the ark on Shabbat and Yom Tov morning; it is also said in the "Atah Horaisa" ("You have been shown") prayer recited before opening the ark on Simchat Torah. In the Sephardi liturgy, Psalm 51 is one of the additional psalms recited on Yom Kippur night.