"The Lord our God is one Lord" (The Shema)
When a scribe asked Jesus what was the great commandment, Jesus answered by quoting Deuteronomy 6:4-5, which begins, “Hear, O Israel” (“Shema Yisrael” in Hebrew). These verses form the beginning of The Shema, the most important part of Jewish prayers because of its declaration of the oneness of God. The Shema is often the first Scripture that a Jewish child learns, as parents obey God’s instruction to teach “these words . . . diligently unto thy children."
Now these are the commandments, the statutes, and the judgments, which the Lord your God commanded to teach you, that ye might do them in the land whither ye go to possess it: That thou mightest fear the Lord thy God, to keep all his statutes and his commandments, which I command thee, thou, and thy son, and thy son's son, all the days of thy life; and that thy days may be prolonged. Hear therefore, O Israel, and observe to do it; that it may be well with thee, and that ye may increase mightily, as the Lord God of thy fathers hath promised thee, in the land that floweth with milk and honey.
Hear, O Israel: The Lord our God is one Lord: And thou shalt love the Lord thy God with all thine heart, and with all thy soul, and with all thy might.
And these words, which I command thee this day, shall be in thine heart: And thou shalt teach them diligently unto thy children, and shalt talk of them when thou sittest in thine house, and when thou walkest by the way, and when thou liest down, and when thou risest up. And thou shalt bind them for a sign upon thine hand, and they shall be as frontlets between thine eyes. And thou shalt write them upon the posts of thy house, and on thy gates.