Shema
Prayer
Shema Yisrael is a Jewish prayer that serves as a centerpiece of the morning and evening Jewish prayer services. Its first verse encapsulates the monotheistic essence of Judaism: "Hear, O Israel: YHVH is our God, YHVH is one", found in Deuteronomy... Wikipedia
Babylonian Talmud: Berakhot
Other rabbinic codes: Kitzur Shulchan Aruch, ch. 17