Matthew 5:34

5:34 But I say to you, do not take oaths at all – not by heaven, because it is the throne of God,

Matthew 5:37

5:37 Let your word be ‘Yes, yes’ or ‘No, no.’ More than this is from the evil one. ¹ 

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¹ tn The term πονηροῦ (ponhrou) may be understood as specific and personified, referring to the devil, or possibly as a general reference to evil. It is most likely personified, however, since it is articular (τοῦ πονηροῦ, tou ponhrou). Cf. also “the evildoer” in v. 39, which is the same construction.