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. Verse 4 is part of the Ushpizin ceremony on Sukkot. In the Siddur Avodas Yisroel, Psalm 51 is the Song of the Day for Shabbat Parah and Shabbat Ki Tavo. This psalm is also said on Wednesday nights after the recital of Aleinu in Maariv. The entire psalm is part of Tikkun Chatzot. It is also recited as a prayer for forgiveness. New Testament Verse 4 is quoted in Romans . Eastern Orthodox The most frequently used psalm in the Eastern Orthodox and Greek Catholic Churches, Psalm 50 (Septuagint numbering) it is called in the Greek language Ἥ Ἐλεήμων He Eleḯmon, and begins in Greek Ἐλέησόν με, ὁ Θεός Eléïsón me, o Theós. In the Daily Office it is recited in each of three aggregates (evening, morning and noonday). In the Divine Liturgy it is recited by the deacon while he censing the entire church at the conclusion of the Proskomedie, which is also known as killing Satan. It is also a part of many sacraments and other services, notably, as a penitential psalm, during the Mystery of Repentance. In the Agpeya, Coptic Church's book of hours, it is recited at every office throughout the day as a prayer of confession and repentance. Catholic Church In Western Christianity, Psalm 51 (using the Masoretic numbering) is also used liturgically. In the Catholic Church this psalm may be assigned by a priest to a penitent as a penance after Confession. Verse 7 of the psalm is traditionally sung as the priest sprinkles holy water over the congregation before Mass, in a rite known as the Asperges me, the first two words of the verse in Latin. This reference lends a striking