According to ancient biblical theology developed after the return from the Babylonian exile, the Word of God (called Memra in Aramaic) is a manifestation of God himself. The concept was based on the various texts of the Old Testament. The scriptures teach that no man can see God, and yet some did see Him. That paradox led to the creation of Memra theology of God having two forms. The unperceivable and unseen form we call today God the Father. And, the perceivable by our senses, called the Word of God (Memra/Logos). It would be every manifestation of God, which a human can see, hear or feel. What started as an observation during the careful reading of the text of the bible fully materialized in the person of Jesus Christ. What followed was over a century of debates between the believing Jews seeing Jesus as a full manifestation of the Word of God (Memra/Logos) and unbelieving ones rejecting it. Eventually the whole concept was branded as heretical by the mainstream rabbinical Judaism in the second century A.D. Since it was too Christian like they got read of it completely. The memory of it was largely forgotten until recently. The Islamic theology developed over a half millennium later, and influenced by the Neoplatonism, had no frame of reference or understanding of those ideas.
The authors of the New Testament knew and fully embraced the philosophy of the Memra. Since the language of the NT is Greek, we know it as Logos. The opening of John's gospel (John 1:1-4) is the best proof of that:
In the beginning was the Word, and the Word was with God, and the Word
was God. He was with God in the beginning. Through him all things were
made; without him nothing was made that has been made. In him was
life, and that life was the light of all mankind.
The New Testament scriptures talking about God the Father:
Now to the King eternal, immortal, invisible, the only God, be honor
and glory for ever and ever. Amen. (1 Timothy 1:17)
He alone can never die, and he lives in light so brilliant that no
human can approach him. No human eye has ever seen him, nor ever will.
All honor and power to him forever! Amen. (1 Timothy 6:16)
No one has ever seen God; but if we love one another, God lives in us
and his love is made complete in us. (1 John 4:12)
The scriptures calling Jesus Christ the image of invisible God:
The Son is the radiance of God’s glory and the exact representation of
His nature, upholding all things by His powerful word. After He had
provided purification for sins, He sat down at the right hand of the
Majesty on high. (Hebrews 1:3)
No one has ever seen God, but the one and only Son, who is himself God
and is in closest relationship with the Father, has made him known.
(John 1:18 )
A handful of quotes from the targums (rabbinic interpretations of the OT in Aramaic) talking about the Word of God (Memra/Logos):
And the Word of the Lord created man in His likeness, in the likeness
of the presence of the Lord He created him, the male and his
yoke-fellow He created them. (Targum Jerusalem, Genesis 1:27)
Walking in the garden in the strength of the day...And the Word of the
Lord God called to Adam, and said to him, Behold, the world which I
have created is manifest before Me; and how thinkest thou that the
place in the midst whereof thou art, is not revealed before Me? Where
is the commandment that I taught thee? (Targum Jerusalem, Genesis 3:9)
And the Word of the Lord God said, Behold, Adam whom I have created is
sole in my world, as I am sole in the heavens above. It is to be that
a great people are to arise from him; from him will arise a people who
will know how to discern between good and evil. And now it is good
that we keep him from the garden of Eden before he stretch forth his
hand and take also of the fruit of the tree of life, and eat, and live
for ever. (Targum Jerusalem, Genesis 3:22)
And the Word of the Lord had caused showers of favour to descend upon
Sedom and Amorah, to the intent that they might work repentance, but
they did it not: so that they said, Wickedness is not manifest before
the Lord. Behold, then, there are now sent down upon them sulphur and
fire from before the Word of the Lord from Heaven. (Targum Jonathan,
Genesis 19:24)
And the Word of the Lord said to Mosheh, He who spake to the world,
Be, and it was; and who will speak to it, Be, and it will be. And he
said, Thus shalt thou speak to the sons of Israel, EHEYEH hath sent me
unto you. (Targum Jerusalem, Exodus 3:14)
And the Lord was revealed in His Word unto Abraham, to Izhak, and to
Jakob, as the God of Heaven; but the Name of the Word of the Lord was
not known to them. (Targum Jerusalem, Exodus 6:3)
It is a night to be observed and celebrated for the liberation from
before the Lord in bringing forth the sons of Israel, made free from
the land of Mizraim. Four nights are there written in the Book of
Memorial. Night first; when the Word of the Lord was revealed upon the
world as it was created; when the world was without form and void, and
darkness was spread upon the face of the deep, and the Word of the
Lord illuminated and made it light; and he called it the first night.
Night second; when the Word of the Lord was revealed unto Abraham
between the divided parts; when Abraham was a son of a hundred years,
and Sarah was a daughter of ninety years, and that which the Scripture
saith was confirmed,--Abraham a hundred years, can he beget? and
Sarah, ninety year old, can she bear? Was not our father Izhak a son
of thirty and seven years, at the time he was offered upon the altar?
The heavens were (then) bowed down and brought low, and Izhak saw
their realities, and his eyes were blinded at the sight, and he called
it the second night. The third night; when the Word of the Lord was
revealed upon the Mizraee, at the dividing of the night; His right
hand slew the firstborn of the Mizraee, His right hand spared the
firstborn of Israel; to fulfil what the Scripture hath said, Israel is
My firstborn son. And he called it the third night. Night the fourth;
when the end of the age will be accomplished, that it might be
dissolved, the bands of wickedness destroyed and the iron yoke broken.
Mosheh came forth from the midst of the desert; but the King Meshiha
(comes) from the midst of Roma. The Cloud preceded that, and the Cloud
will go before this one; and the Word of the Lord will lead between
both, and they shall proceed together. This is the night of the Pascha
before the Lord, to be observed and celebrated by the sons of Israel
in all their generations. (Targum Jerusalem, Exodus 12:42)
And the Word of the Lord conducted the people by the way of the desert
of the sea of Suph; armed in good works went up the sons of Israel,
free from the land of Mizraim. (Targum Jerusalem, Exodus 13:18)