The Oneness of God is the message of Moses and Jesus and Mohammad and all the Prophets peace be upon them.
between the lines of Torah does not find a prophet, and not the Messenger, and not even a priest speaking of the Trinity.
we find that they are all calling and even declare the oneness of God.
Any one that God is not a partner or associate and do not like him and do not unprecedented and has no end.

This pause to think, with this fact , as offered by your Bible,
Despite all that has happened in the distortion and changed.

That all the people of the earth may know that the LORD is God, and that there is none else . king1-8/60
And Hezekiah prayed before the LORD, and said, O LORD God of Israel, which dwellest between the cherubims, thou art the God, even thou alone, of all the kingdoms of the earth; thou hast made heaven and earth. King2-19/15
that all the kingdoms of the earth may know that thou art the LORD God, even thou only. . King2-19/19
For who is God save the LORD? Psalms-18/31
O God, is very high, who hast done great things: O God, who is like unto thee! . Psalms -71/19
8 Among the gods there is none like unto thee, O Lord; neither are there any works like unto thy works.
9 All nations whom thou hast made shall come and worship before thee, O Lord; and shall glorify thy name.
10 For thou art great, and doest wondrous things: thou art God alone. Psalms -86/8:10
Let them praise the name of the LORD: for his name alone is excellent. Psalms -148/13
even from everlasting to everlasting, thou art God. . Psalms -90/2

that all the kingdoms of the earth may know that thou art the LORD, even thou only. Isaiah37/20
I am the LORD: that is my name: and my glory will I not give to another, neither my praise to graven images. Isaiah- 42/8
hus saith the LORD the King of Israel, and his redeemer the LORD of hosts; I am the first, and I am the last; and beside me there is no God. Isaiah- 44/6
5 I am the LORD, and there is none else, there is no God beside me: I girded thee, though thou hast not known me:
6 That they may know from the rising of the sun, and from the west, that there is none beside me. I am the LORD, and there is none else.
7 I form the light, and create darkness: I make peace, and create evil: I the LORD do all these things. Isaiah- 45/5:7
Even if we look at the Bible we find The Messenger of Allah Christ call to The Oneness of God
28 And one of the scribes came, and having heard them reasoning together, and perceiving that he had answered them well, asked him, Which is the first commandment of all?
29 And Jesus answered him, The first of all the commandments is, Hear, O Israel; The Lord our God is one Lord:
30 And thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind, and with all thy strength: this is the first commandment.
31 And the second is like, namely this, Thou shalt love thy neighbour as thyself. There is none other commandment greater than these.
32 And the scribe said unto him, Well, Master, thou hast said the truth: for there is one God; and there is none other but he.
Mark-12/28:32
And this is the one that came by Islam Where The Holy Koran says
« وَإِلَهُكُمْ إِلَهٌ وَاحِدٌ لَا إِلَهَ إِلَّا هُوَ الرَّحْمَنُ الرَّحِيمُ » (163 البقرة)
And your god is one God ; There is no deity worthy of worship except Him, the Entirely Merciful, the Especially Merciful
And Prophet Muhammad says
" لَا تُطْرُونِي كَمَا أَطْرَتِ النَّصَارَى عِيسَى ابْنَ مَرْيَمَ ، فَإِنَّمَا أَنَا عَبْدُ اللَّهِ وَرَسُولُهُ "
الْبُخَارِيُّ
Do not overpraise me as the Christians did to the son of Mary. I am just Allah's servant You may just say `Muhammad is the servant and Messenger of Allah'. Bukhari

And the meaning of do not overpraise any Complimenting overload such as the Christians of the Prophet of Allah and His Messenger Christ ;
They made him a god with Allah, and some of them claimed that he is God, and some of them claimed that he was the son of God

So the first reason to send God's messengers is Worship God alone . The Oneness of God .
Therefore, I invite you to Islam :
That the witness that there is no god but Allah ; Muhammad is the servant and Messenger of Allah and Isa (Jesus) son of Maryam is the servant and Messenger of Allah.