This is the answer from Dr. Warren https://www.goodnewsfl.org/is-jesus-god/
The “Shema,” the beautiful affirmation of Israel about God, states, “Hear O Israel, The Lord our God, the Lord is one” (Deuteronomy 6:4). The Hebrew word for “one” is “echad.” How can this divine unity be consistent with the three persons of the Christian Trinity, the doctrine that is a necessary precondition to affirm the divinity of Jesus?

Instructively, Moses uses the same word “echad” in his description of mankind, made in God’s image as male and female. Moses writes, “Therefore a man shall leave his father and his mother and hold fast to his wife, and they shall become one flesh” (Genesis 2:24). We understand that there is a mystery unity in the multiplicity of the two persons constituting a marriage. There is a oneness that is authentic but that does not obliterate the two persons, male and female. The fact that man and woman are in the image of God further implies that there is something in their unity within diversity that reflects something originally in God himself.

Consistent with this mystery is the plural form of the Hebrew word for God (Elohim) that is conjoined with singular verbs but retains plural pronouns. It is a complex grammar reflecting the mystery of God. “Let us (plural) make (plural) man in our (plural) image…and God (plural) created (singular) man in his (singular) own image” (Genesis 1:26-27). This may be compared with the baptismal formula Jesus gave his disciples, “Baptizing them in the name (singular) of the Father, and of the Son, and of the Holy Spirit (plural)” (Matthew 28:19).