Q: What is God?

A: God is a Spirit,(1) infinite, eternal, and unchangeable, in his being, (2) wisdom, (3) power, (4) holiness, (5) justice, (6) goodness, (7) and truth. (8)

1. John 4:24. God is a Spirit: and they that worship him must worship him in spirit and in truth.

2. Psalm 90:2. From everlasting to everlasting, thou art God.
Malachi 3:6. For I am the Lord, I change not; therefore are ye sons of Jacob not consumed.
James 1:17. The Father of lights, with whom is no variableness, neither shadow of turning.
1 Kings 8:27. But will God indeed dwell on the earth? Behold, the heaven and heaven of heavens cannot contain thee; how much less this house that I have builded?
Jeremiah 23:24. Can any hide himself in secret places that I shall not see him? Saith the Lord. Do not I fill heaven and earth? Saith the Lord.
Isaiah 40:22. It is he that sitteth upon the circle of the earth, and the inhabitants thereof are as grasshoppers; that stretcheth out the heavens as a curtain, and spreadeth them out as a tent to dwell in.

3. Psalm 147:5. Great is our Lord, and of great power: his understanding is infinite.
Romans 16:27. To God only wise, be glory through Jesus Christ for ever. Amen.

4. Genesis 17:1. And when Abram was ninety years old and nine, the Lord appeared to Abram, and said unto him, I am the Almighty God; walk before me, and be thou perfect.
Revelation 19:6. And I heard as it were the voice of a great multitude, and as the voice of many waters, and as the voice of mighty thunderings, saying, Alleluia: for the Lord God omnipotent reigneth.

5. Isaiah 57:15. For thus saith the high and lofty One that inhabiteth eternity, whose name is Holy; I dwell in the high and holy place, with him also that is of a contrite and humble spirit, to revive the spirit of the humble, and to revive the heart of the contrite ones.
John 17:11. And now I am no more in the world, but these are in the world, and I come to thee. Holy Father, keep through thine own name those whom thou hast given me, that they may be one, as we are.Revelation 4:8. And the four beasts had each of them six wings about him; and they were full of eyes within: and they rest not day and night, saying, Holy, holy, holy, Lord God Almighty, which was, and is, and is to come.

6. Deuteronomy 32:4. He is the Rock, his work is perfect: for all his ways are judgment: a God of truth and without iniquity, just and right is he.

7. Psalm 100:5. For the Lord is good; his mercy is everlasting; and his truth endureth to all generations.
Romans 2:4. Or despisest thou the riches of his goodness and forbearance and longsuffering; not knowing that the goodness of God leadeth thee to repentance?

8. Exodus 34:6. And the Lord passed by before him, and proclaimed, The Lord, The Lord God, merciful and gracious, longsuffering, and abundant in goodness and truth.
Psalm 117:2. For his merciful kindness is great toward us: and the truth of the Lord endureth for ever. Praise ye the Lord.

From the Westminster Shorter Catechism.