Heidelberg Catechism · Lord's Day 37
102. May we also swear by saints or other creatures?
Answer
No, for a lawful oath is a calling upon God, as the only one who knows the heart, to bear witness to the truth, and to punish me if I swear falsely. No creature is worthy of such an honor.
Scripture references
2 Corinthians 1:23 · Romans 9:1 · Matthew 5:34-37 · James 5:12
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