WSC Q.47: What is forbidden in the first commandment?
The first commandment forbiddeth the denying, (Ps. 14:1) or not worshipping and glorifying the true God as God, (Rom. 1:21) and our God; (Ps. 81:10–11) and the giving of that worship and glory to any other, which is due to him alone. (Rom. 1:25–26)
WLC Q.105: What are the sins forbidden in the first commandment?
The sins forbidden in the first commandment are, Atheism, in denying or not having a God; (Ps. 14:1, Eph. 2:12) Idolatry, in having or worshipping more gods than one, or any with or instead of the true God; (Jer. 2:27–28, 1 Thess. 1:9) the not having and avouching him for God, and our God; (Ps. 81:11) the omission or neglect of any thing due to him, required in this commandment; (Isa. 43:22–24) ignorance, (Jer. 4:22, Hos. 4:1,6) forgetfulness, (Jer. 2:32) misapprehensions, (Acts 17:23,29) false opinions, (Isa. 40:18) unworthy and wicked thoughts of him; (Ps. 50:21) bold and curious searching into his secrets; (Deut. 29:29) all profaneness, (Tit. 1:16, Heb. 12:16) hatred of God; (Rom. 1:30) self-love, (2 Tim. 3:2) self-seeking, (Phil. 2:21) and all other inordinate and im-moderate setting of our mind, will, or affections upon other things, and taking them off from him in whole or in part; (1 John 2:15–16, 1 Sam. 2:29, Col. 3:2,5) vain credulity, (1 John 4:1) unbelief, (Heb. 3:12) heresy, (Gal. 5:20, Tit. 3:10) misbelief, (Acts 26:9) distrust, (Ps. 78:22) despair, (Gen. 4:13) incorrigibleness, (Jer. 5:3) and insensibleness under judgments, (Isa. 42:25) hardness of heart, (Rom. 2:5) pride, (Jer. 13:15) presumption, (Ps. 19:13) carnal security, (Zeph. 1:12) tempting of God; (Matt. 4:7) using unlawful means, (Rom. 3:8) and trusting in lawful means; (Jer. 17:5) carnal delights and joys; (2 Tim. 3:4) corrupt, blind, and indiscreet zeal; (Gal. 4:17, John 16:2, Rom. 10:2, Luke 9:54–55) lukewarmness, (Rev. 3:16) and deadness in the things of God; (Rev. 2:1) estranging ourselves, and apostatizing from God; (Ezek. 14:5, Isa. 1:4–5) praying, or giving any religious worship, to saints, angels, or any other creatures; (Rom. 10:13–14, Hosea 4:12, Acts 10:25–26, Rev. 19:10, Matt. 4:10, Col. 2:18, Rom. 1:25) all compacts and consulting with the devil, (Lev. 20:6, 1 Sam. 28:7,11, 1 Chron. 10:13–14) and hearkening to his suggestions; (Acts 5:3) making men the lords of our faith and conscience; (2 Cor. 1:24, Matt. 23:9) slighting and despising God and his commands; (Deut. 32:15, 2 Sam. 12:9, Prov. 13:13) resisting and grieving of his Spirit, (Acts 7:51, Eph. 4:30) discontent and impatience at his dispensations, charging him foolishly for the evils he inflicts on us; (Ps. 73:2–3,13–15,22, Job 1:22) and ascribing the praise of any good we either are, have or can do, to fortune, (1 Sam. 6:7–9) idols, (Dan. 5:23) ourselves, (Deut. 8:17, Dan. 4:30) or any other creature. (Hab. 1:16)