Church of England, Thirty Nine Articles [1571], Article 39, Of a Christian Man's Oath
Source: Church of England, Thirty Nine Articles [1571], available at: http://name.umdl.umich.edu/A72013.0001.001
XXXIX. Of a Christian mans othe.
As we confesse that vayne and rashe swearing is forbidden Christian men by our lord Jesus Christe, and James his Apostle: So we iudge that Christian religion doth not prohibite, but that a man may sweare when the Magistrate requireth, in a cause of faith and charitie, so it be done accordyng to the prophetes teaching, in iustice, iudgement, and trueth.
