It is stimulating and reassuring to know that the Bible makes a clear declaration that God is one, Deuteronomy 6:4. In Hebrew this is generally quoted as: “Shema Yisrael Adonai eloheinu Adonia ehad” “Hear, O Israel, The Lord our God is one LORD,” and is referred to in Judaism as the Shema taken from the very first word, “hear.” This biblical principle then is a direct command of the ‘Monotheistic’ belief and practice of the early Israelites.

(Kulwant Singh Boora, The Oneness of God and the Doctrine of the Trinity, Bloomington, Indiana: AuthorHouse, 2009, 4)