swear on the Bible

idiom

Definition of swear on the Bible

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

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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 27 Nov. 2020.

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