The holy Qur’an says: God is the first and the last, the alpha and the Omega, Huwal Awwal wal âkhir هُوَ الْأَوَّلُ وَالْآخِرُ
This is what is called the existence of being Al-Wujud al-Dzâti الوجود الذاتي . This is inherent existence and not acquired one from anywhere. This type of existence applies only to God (Glorified be He) and it is one of His Attributes, as His existence had nothing before or after it. This attribute of existence is in accordance to God’s Positive quality (Nafsiyah) نفسية therefore the non-existence or the beginning of God is impossible and it is called the impossibility of God attribute or the Salbiyah سلبية) in Islamic theology.
People are demanded to worship God who belongs to this attribute only, and it is a big sin to worship anything who has the beginning be it Angel, holy man, prophet of God, Ghost, Sun, Mountain, rock, etc) because they are a mere creation not a creator.
In the hebrew Bible YHWH too has this Al-Wujud al-Dzâti quality. He exists before any other creations.
We read in the Torah:
בְּרֵאשִׁית בָּרָא אֱלֹהִים אֵת הַשָּׁמַיִם וְאֵת הָאָרֶץ
Beresyit Bara ELOHIM et HaSyamayim we-et HaArets
“In the beginning, ELOHIM created heaven and earth”
In the Targum we read:
בְּקַדְמִין, בְּרָא יְיָ, יָת שְׁמַיָּא, וְיָת אַרְעָא.
Be-qadmin Beraa YY,Yat Syemayya weYat ar’a
“On Qidam (which exist before everything else), YY created heaven and earth ”
Great jewish sage, rabbi Sa’adiah ben Yosef Gaon in his commentary wrote (in Judeo-arabic document)
אַוַּל מַא כְ׳לַק אללָּה אלסְּמַאוַאת וַאל אַרץ׳
Awwala Ma KholaqALLAH (In the beginning was what Allah has created)
as-samaawati wal ard (Heaven and the Earth)
Here we understand that YHWH is ALLAH itself whom have created things which previously did not exist.
Linguistically YHWH means “He who always exists”
Ponder this verse from the Hebrew Bible
וַיֹּאמֶר אֱלֹהִים אֶל-מֹשֶׁה אֶהְיֶה אֲשֶׁר אֶהְיֶה וַיֹּאמֶר כֹּה תֹאמַר לִבְנֵי יִשְׂרָאֵל אֶהְיֶה שְׁלָחַנִי אֲלֵיכֶם
wayyomer Elohim el mosyeh (and God said to Moses) EHYEH ASYER EHYEH (I exists who I exist) wayyomer (and He said) koh Tomar (thus you say) li-beney Yisrael (to people of Israel) EHYEH (I exists) syelachni (has sent me) aleykhem (to you)
Rabbi Sa’adiah ben Yosef Gaon also in his commentary wrote in particular to this verse (in judeo -arabic)
קַאל לֹה . אַלאַזְלִי אַלְּדִ׳י לַא יְזוּּל.
כְדַ׳א קֻל לִבְנִי אִסרַאִיל .
אַלאַזְלִי בַעַת׳נִי אְלַיכֻם
Qoola lah (He said to him)
Al azali (exits with no beginning) Alladzi la Yazul (who exist without end)
tsumma qoola (then He said)
kadzaa qul (likewise it was said) li bani isrooil (to the people of Israel)
Al Azali (those who has no beginning ) ba’atsni (has sent me) ilaykum (to you)
The name YHWH יהוה
From dictionary of arabic bible under YHWH يهوه we read:
ولفظة يهوه هي فعل المضارع من هيه أو هوه كما كان في الأصل، ومعناه كان، أو حدث، أو وجد وبعبارة أخرى هو الذي كان، والذي أعلن ذاته وصفاته
“and the termيهوه is in imperfect tense which come from from the word Hayah or Howeh,like the the word Kaana originally and with the meaning “be” or Hadats “make into existence” or Wujud “exist”, and other similar meaning related to “He who (always) exist” and this explains His essence and attribute.”
Whereas Jesus (whom trinitarian believe a hybrid god-man) came into existence only in some 2.000 years ago. He was born of a woman and partaking of a flesh and blood nature just like any other human being. He has beginning therefore Jesus can not be God, the creator of the everything , the first and the last.