Along with the tradition of swearing on the Bible also came the option of affirming an oath without swearing. There were, and still are, some Christian sects who believe that swearing an oath could be "taking the Lord's name in vain." These people were allowed to take what was then called the "Quaker oath" (when Quakers were still G-D fearing Christians and not the politically-correct leftist saps they are today).
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BTW, can you cite any examples of Christian sects today who believe that swearing an oath is 'taking the Lord's name in vain'? Just curious.