Third, the Shema says that Yahweh is
one: “Hear O Israel, the LORD our God, the LORD is
one [Heb. echad].” Unlike the Hebrew word
yachid, which corresponds to the Islamic notion of an abstract numerical oneness,
tawhid from the Arabic, the Bible uses the word
echad for God,
3 a word that allows for and which often means unity, such as exists between a husband and wife, constituting them “one flesh”, or between morning and evening, constituting them “one day”, or such as Christians profess when they say that the Father, the Son, and the Holy Spirit are “one being”, “one essence”, or “one God”.