The Heidelberg Catechism: Lord's Day 37
101. Question: But may we swear an oath by the Name of God in a godly manner?
Answer: Yes, when the government demands it of its subjects, or when necessity requires it, in order to maintain and promote fidelity and truth, to God's glory and for our neighbor’s good. Such oath-taking is based on God's Word and was therefore rightly used by saints in the Old and the New Testament.
 Deut. 6:13; 10:20; Jer. 4:1, 2; Heb. 6:16.  Gen. 21:24; 31:53; Josh. 9:15; I Sam. 24:22; I Kings 1:29, 30; Rom. 1:9; II Cor. 1:23.
102. Question: May we also swear by saints or other creatures?
Answer: No. A lawful oath is a calling upon God, who alone knows the heart, to bear witness to the truth, and to punish me if I swear falsely. No creature is worthy of such honour.
 Rom. 9:1; II Cor. 1:23.  Matt. 5:34-37; 23:16-22; James 5:12.
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Listen, my son, and be wise, and set your heart on the right path: (Proverbs 23:19)
“Enter by the narrow gate. For the gate is wide and the way is easy that leads to destruction, and those who enter by it are many. For the gate is narrow and the way is hard that leads to life, and those who find it are few.