swear on the Bible

idiom

: to put a hand on the Bible and make a formal promise to tell the truth

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swear on one's mother's grave
swear on the Bible
swear out
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“Swear on the Bible.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/swear%20on%20the%20Bible. Accessed 24 May. 2025.

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