Deuteronomy 6:4, "Hear, O Israel: The LORD our God, the LORD is one!

And in New Testament Jesus Himself quoted Deuteronomy 6:4 in Mark 12:29, "Jesus answered him, "The first of all the commandments is: 'Hear, O Israel, the LORD our God, the LORD is one."

Mark 12:32, So the scribe said to Him, "Well said, Teacher. You have spoken the truth, for there is one God, and there is no other but He."

Romans 3:30, "Since there is one God who will justify the circumcised by faith and the uncircumcised through faith."

Ephesians 4:6, "One God and Father of all, Who is above all, and through all, and in you all."

There is only one Throne:

Revelation 3:21 "To him that overcometh will I grant to sit with me in my throne, even as I also overcame, and am set down with my Father in his throne".

God the Father & Son are One:

Isaiah 9:6— "For unto us a Child is born, Unto us a Son is given; And the government will be upon His shoulder. And His name will be called Wonderful, Counselor, Mighty God, Everlasting Father, Prince of Peace."

John 14:9-11— Jesus saith unto him, Have I been so long time with you, and yet hast thou not known me, Philip? he that hath seen me hath seen the Father; and how sayest thou then, Shew us the Father? Believest thou not that I am in the Father, and the Father in me? the words that I speak unto you I speak not of myself: but the Father that dwelleth in me, he doeth the works. Believe me that I am in the Father, and the Father in me: or else believe me for the very works' sake.

John 15:26— But when the Comforter is come, whom I will send unto you from the Father, even the Spirit of truth, which proceedeth from the Father, he shall testify of me

The Holy Spirit is the Spirit of Jesus:

Matthew 3:11—“I [John the Baptist] indeed baptize you with water unto repentance: but he that cometh after me is mightier than I, whose shoes I am not worthy to bear: he shall baptize you with the Holy Ghost, and with fire.”

John 14:18— I will not leave you comfortless: I will come to you again.

John 20:22— And when he had said this, he breathed on them, and saith unto them, Receive ye the Holy Ghost.

John 15:26—“But when the Comforter is come, whom I will send unto you from the Father, even the Spirit of truth, which proceedeth from the Father, he shall testify of me.”

Romans 8:9—“But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of his.”

Galatians 4:6—“And because ye are sons, God hath sent forth the Spirit of his Son into your hearts, crying, Abba, Father.”

God is life:

John 5:26— For as the Father hath life in himself; so hath he given to the Son to have life in himself.

God is self-existent:

Exodus 3:14— And God said unto Moses, I AM THAT I AM: and he said, Thus shalt thou say unto the children of Israel, I AM hath sent me unto you.

God is infinite:

Psalms 145:3— Great is the LORD, and greatly to be praised; and his greatness is unsearchable.

God is immutable:

James 1:17— Every good gift and every perfect gift is from above, and cometh down from the Father of lights, with whom is no variableness, neither shadow of turning.

God is truth:

John 17:3— And this is life eternal, that they might know thee the only true God, and Jesus Christ, whom thou hast sent.

God is love:

1 John 4:8—  He that loveth not knoweth not God; for God is love.

God is eternal:

Psalms 90:2— Before the mountains were brought forth, or ever thou hadst formed the earth and the world, even from everlasting to everlasting, thou art God.

God is holy:

1 Peter 1:16— Because it is written, Be ye holy; for I am holy.

God is omnipresent:

Psalms 139:8—  If I ascend up into heaven, thou art there: if I make my bed in hell, behold, thou art there.

God is omniscient:

Psalms 147:4-5—  He telleth the number of the stars; he calleth them all by their names. Great is our Lord, and of great power: his understanding is infinite.

God is omnipotent:

Matthew 19:26—  But Jesus beheld them, and said unto them, With men this is impossible; but with God all things are possible.

Jesus is The only way:

John chapter 10 verses 1-9-11-14—   `Verily, Verily, I say unto you, He that entereth not by the door into the sheepfold, but climbeth up some other way, the same is a thief and a robber. I am the door: by Me if any man enter in, he shall be saved, and shall go in and out, and find pasture. I am the good Shepard: the good Shepard giveth His life for the sheep. I am the good Shepard, and know my sheep, and am known of mine.