WSC Q.55: What is forbidden in the third commandment?
The third commandment forbiddeth all profaning and abusing of any thing whereby God maketh himself known. (Mal. 1:6–7,12, Mal. 2:2, Mal. 3:14)
WLC Q.113: What are the sins forbidden in the third commandment?
The sins forbidden in the third commandment are, the not using of God’s name as is required; (Mal. 2:2) and the abuse of it in an ignorant, (Acts 17:23) vain, (Prov. 30:9) irreverent, profane, (Mal. 1:6–7,12, Mal. 3:14) superstitious (1 Sam. 4:3–5, Jer. 7:4,9–10,14,31, Col. 2:20–22) or wicked mentioning or otherwise using his titles, attributes, (2 Kings 18:30,35, Exod. 5:2, Ps. 139:20) ordinances, (Ps. 50:16–17) or works, (Isa. 5:12) by blasphemy, (2 Kings 19:22, Lev. 24:11) perjury; (Zech. 5:4, Zech. 8:17) all sinful cursings, (1 Sam. 17:43, 2 Sam. 16:5) oaths, (Jer. 5:7, Jer. 23:10) vows, (Deut. 23:18, Acts 23:12,14) and lots; (Esth. 3:7, Esth. 9:24, Ps. 22:18) violation of our oaths and vows, if lawful (Ps. 24:4, Ezek. 17:16,18–19) and fulfilling them, if of things unlawful; (Mark 6:26, 1 Sam. 25:22,32–34) murmuring and quarrelling at, (Rom. 9:14,19–20) curious prying into, (Deut. 29:29) and misapplying of God’s decrees (Rom. 3:5,7, Rom. 6:1) and providences; (Eccl. 8:11, Eccl. 9:3, Ps. 39) misinterpreting, (Matt. 5:21–48) misapplying, (Ezek. 13:22) or any way perverting the word, or any part of it; (2 Pet. 3:16, Matt. 22:24–31,25,28–30) to profane jests, (Isa. 22:13, Jer. 23:34,36,38) curious or unprofitable questions, vain janglings, or the maintaining of false doctrines; (1 Tim. 1:4,6–7, 1 Tim. 6:4–5,20, 2 Tim. 2:14, Tit. 3:9) abusing it, the creatures, or any thing contained under the name of God, to charms, (Deut. 18:10–14,11–12, Acts 19:13) or sinful lusts and practices; (2 Tim. 4:3–4, Rom. 13:13–14, 1 Kings 21:9–10, Jude 4) the maligning, (Acts 13:45, 1 John 3:12) scorning, (Ps. 1:1, 2 Pet. 3:3) reviling, (1 Pet. 4:4) or any wise opposing of God’s truth, grace, and ways; (Acts 13:45–46,50, Acts 4:18, Acts 19:9, 1 Thess. 2:16, Heb. 10:29) making profession of religion in hypocrisy, or for sinister ends; (2 Tim. 3:5, Matt. 23:14, Matt. 6:1–2,5,16) being ashamed of it, (Mark 8:38) or a shame to it, by unconformable, (Ps. 73:14–15) unwise, (1 Cor. 6:5–6, Eph. 5:15–17) unfruitful, (Isa. 5:4, 2 Pet. 1:8–9) and offensive walking, (Rom. 2:23–24) or backsliding from it. (Gal. 3:1,3, Heb. 6:6)