Zechariah prophesied a time when only Israel's God is the only God recognized on earth.
It was said that the Greeks in the 6th century BCE, at the time of Zechariah, called their Creator god "The One." Perhaps Zechariah's message contains a contemporary anti-Hellenist polemic along the lines of:
Only YHVH, the God of Israel, will be "The One"…
and his name "The One" [contra any gods of the Greeks].
[C.H. Gordon, "His Name is One," Journal of Near Eastern Studies 29 (1970): 198-199]
The very fact that the God who is YHWH speaks of Himself as “I” and “Me” and is referred to as “You” (singular) and “He” and “Him” thousands upon thousands of times should convince all Bible readers of the singularity of God. In addition, words like "by myself" and "all alone" further proves this.
One answer stated,
"The one question that does need addressing with the Shema is whether the people considered 'one' to be a numeric 'one', or not. They did not. Here is another Commentary on that:
"one. Heb. ehad = a compound unity (Lat. unus), one made up of others... It is not yahid, which is (Lat. unicas), unique - a single or only one." The Companion Bible, p.247, Zondervan 1923"
Echad is a numeral adjective, the ordinary word for the number one. In counting in Hebrew one says , echad (one) sh'nayim (two)..
The word one in the phrase "one God" does not impart plurality to the word God. Even if the compound noun is made up of a number of parts or items, the word 'one which stands before it is not in any way altered because of its closeness to the compound noun.
How would proponents of one as a "compound one" explain Ecclesiastes 4:9 "two are better than one" Ecclesiastes 4:11 Furthermore, if two lie down together they [e]keep warm, but how can one be warm alone? Ecclessiastes 4:12 And if [f]one can overpower him who is alone, two can resist him.
Echad is the word for the number one in counting. The use of Genesis 2:24 does not mean that one is really plural. The idea of the plurality cannot be found in the word echad at all.
The Shema declares YHVH's singular uniqueness as Israel's God. There is no evidence in the Hebrew Bible that any generation of Israelites understood the Shema as a reference to a compound unity in God.
If they did, who are the others? There is no record in the bible showing the Israelites knew and identified the other members/parts of this compound/composite God, nor is there such evidence in the New Testament. When the scribe asked Jesus which commandment is the foremost, Jesus quoted the Shema. Mark 12:28-30. The scribe asserted Jesus' answer. It is difficult to believe that Jesus or any person that that is postulated to be a part of this composite God, is co-equal and co-eternal with God from the beginning of time, and yet he never appears in the Old Testament.
There is nothing in this account that Jesus reinforced the idea of a compound unity or his place in the Shema, rather, Jesus tested the scribe with a question about his identity. Mark 12:35-37 which speaks of a Lord that sits next to YHWH. Mark 12:36 was quoted from Psalm 110:1
Mark 12:36 ASV
David himself said in the Holy Spirit, The Lord said unto my Lord, Sit thou on my right hand, Till I make thine enemies the footstool of thy feet.
Examining Psalm 110:1 we find,
The LORD
יְהוָ֨ה ׀ (Yah·weh)
Noun - proper - masculine singular
Strong's 3068: LORD -- the proper name of the God of Israel
said
נְאֻ֤ם (nə·’um)
Noun - masculine singular construct
Strong's 5002: An oracle
to my Lord: לַֽאדֹנִ֗י (la·ḏō·nî) Preposition-l | Noun - masculine singular construct | first person common singular Strong's 113: Sovereign, controller
The 1st LORD in Psalm 110:1 is Jehovah/YHWH. The second lord is translated from the Hebrew word adoni. The word adoni is a title which never refers to God. It does not mean God the son. Peter narrated God's plan based on the truth of Psalm 110:1 in Acts 2:33-36 Being therefore by the right hand of God exalted and having received of the Father the promise of the Holy Spirit, he hath poured forth this, which ye see and hear. For David ascended not into the heavens: but he saith himself, The Lord said unto my Lord, Sit thou on my right hand, Till I make thine enemies the footstool of thy feet. Let all the house of Israel therefore know assuredly, that God hath made him both Lord and Christ, this Jesus whom ye crucified.
The God of Jesus made him both Lord and Christ.
Psalm 110:1 could not be interpreted to mean "The LORD [YHWH, Yahweh (H3068), God the Father) is telling King David's Lord [Adon (H113), Adhonay (H136), God the Son" because adoni is not the same as Adonay and that there is no God the Son" in the bible.
There is only one Adonay YHWH.
LORD” or “the LORD” in the OT represents (YHWH) God. This is not to be confused with the Greek word Kurios, which is used of Jesus and is a title of respect, honor and authority. The title “Lord” is used of many people in the Bible not just God and Jesus. God made Jesus both lord and Christ. Nobody makes God lord. Jesus as the Son of God, yes. But, God the Son, no. There is no God the son in the bible.
Peter already identified who the second lord of Psalm 110:1 is and it is Jesus whom he says was crucified. This further proves that the second lord of Psalm 110:1 is adoni because crucifying Adonay is not possible.
John 10:30 could not be taken to mean one God since the Greek word for 'one' here is 'hen,' and is neuter. Theos (Greek for God) is masculine, so if it refers to God then the masculine heis should be used instead of hen.
In addition, if the Father and the Son were but one being, they would be the same being, and they could not be the two being bearing required witness, as John 8:17,18 say they are.
Jesus sums up the Christian quest for eternal life as belief in You (the Father) as the only true God, and him whom thou didst send, even Jesus Christ. John 17:3. The Father is the only God John 5:44. This simple definition unites the Hebrew Old Testament and Greek New Testament.