The 1689 London Baptist Confession, like many other church confessions, endeavors to explain the essential truths of the Christian faith in a clear and orderly way. Below is the LBC’s definition of God and the Trinity. In addition to providing believers with a concise, orthodox explanation on a wide variety of doctrines, these chapters can serve as an excellent Bible study resource.
You can simply go through the confession a chapter at a time, reading through the paragraphs it contains and making use of the Scripture references to see where the Bible teaches on each subject.
This is from chapter two of the London Baptist Confession, paragraphs one to three:
1. The Lord our God is but one only living and true God; whose subsistence is in and of himself, infinite in being and perfection; whose essence cannot be comprehended by any but himself; a most pure spirit, invisible, without body, parts, or passions, who only hath immortality, dwelling in the light which no man can approach unto; who is immutable, immense, eternal, incomprehensible, almighty, every way infinite, most holy, most wise, most free, most absolute; working all things according to the counsel of his own immutable and most righteous will for his own glory; most loving, gracious, merciful, long-suffering, abundant in goodness and truth, forgiving iniquity, transgression, and sin; the rewarder of them that diligently seek him, and withal most just and terrible in his judgments, hating all sin, and who will by no means clear the guilty.
For further study: 1 Corinthians 8:4, 6; Deuteronomy 6:4; Jeremiah 10:10; Isaiah 48:12; Exodus 3:14; John 4:24; 1 Timothy 1:17; Deuteronomy 4:15, 16; Malachi 3:6; 1 Kings 8:27; Jeremiah 23:23; Psalms 90:2; Genesis 17:1; Isaiah 6:3; Psalms 115:3; Isaiah 46:10; Proverbs 16:4; Romans 11:36; Exodus 34:6, 7; Hebrews 11:6; Nehemiah 9:32, 33; Psalms 5:5, 6; Exodus 34:7; Nahum 1:2, 3