The Essence of divinity is found in every single thing - nothing but it exists. Since it causes every thing to be, no thing can live by anything else. It enlivens them; its existence exists in each existent.
Do not attribute duality to God. Let God be solely God. If you suppose that Ein Sof emanates until a certain point, and that from that point on is outside of it, you have dualized. God forbid! Realize, rather, that Ein Sof exisits in each existent. Do not say, "This is a stone and not God." God forbid! Rather, all existence is God, and the stone is a thing pervaded by divinity.
There is nothing that is not pervaded by the power of divinity. If there were, Ein Sof would be limited, subject to duality, God forbid! Rather, God is everything that exists, though everything that exists is not God. It is present in everything, and everything comes into being from it. Nothing is devoid of its divinity. Everything is within it, it is within everything and outside of everything. There is nothing but it.
When you contemplate the Creator, realize that his encampment extends beyond, infinitely beyond, and so, too, in front of you and behind you, east and west, north and south, above and below, infinitely everywhere. Be aware that God fashioned everything and is within everything. There is nothing else. - The Essential Kabbalah, The Heart of Jewish Mysticism by Daniel C. Matt
The Divine is One only, without a second.
- Chandogya Upanishad 6:2:1
He who knows Me as unborn, without a beginning, as the Supreme Lord of the worlds ...
- Bhagavad Gita 10:3
"Sh'ma Yisrael Adonai Elohaynu Adonai Echad"
Hear O Israel, the Lord your God is One.
- Duet 6:4
Say Not Trinity
The Quran, Surah 4:171. O People of the Book! Commit no excesses in your religion: Nor say of God aught but the truth. Christ Jesus the son of Mary was a messenger of God, and His Word, which He bestowed on Mary, and a spirit proceeding from Him: so believe in God and His apostles. Say not "Trinity" : desist: it will be better for you: for God is one God. Glory be to Him: (far exalted is He) above having a son. To Him belong all things in the heavens and on earth. And enough is God as a Disposer of affairs.
Surah 19:88. They say: "God, The Most Gracious has begotten a son!" 89. Indeed ye have put forth a thing most monstrous! 90. At it the skies are ready to burst, the earth to split asunder, and the mountains to fall down in utter ruin, 91. That they should invoke a son for God, The Most Gracious. 92. For it is not consonant with the majesty of God, The Most Gracious that He should beget a son.
Surah 102:3. The Divine begets not, nor is He begotten.
Ein Sof or Ayn Sof (literally means "without end", denoting "boundlessness" and/or "nothingness"), is a Kabbalistic term that usually refers to an abstract state of existence preceding God's Creation of the limited universe. Referers to God's transcendence attribute.
The idea of Trinity in Christina Theology is cause of much confusion, from the time of its introduction during the 4th Century till modern time. Essential to note that Jesus Christ in his original teaching never used the term "Trinity". Thus its no where to be found in Bible. It was first used by Tertullian at the close of the 2nd century, but received wide currency and formal elucidation only in the 4th and 5th centuries. The word Trinity came to common use several centuries after the last books of the Bible was completed.
Interesting to note that neither New Testament, nor the Old Testament has the use of the term Trinity, but the Final Testament, Quran usage the term Trinity to refute it and warn people not to use such term to introduce another level of duality into the Oneness of the Divine. Jesus Christ himself never used such term as well and rather sincerely preferred terms such as "my God and your God", "my Lord and your Lord" and testified to the Divine Oneness.
image credit: arabic calligraphy of the letter Alif, symbolizes Oneness