Matthew 5:36-39

36Neither shalt thou swear by thy head, for thou canst not make one hair white or black.

37But let your speech be, Yea, yea; Nay, nay: and whatsoever is more than these is of the evil one.

38Ye have heard that it was said, An eye for an eye, and a tooth for a tooth:

39but I say unto you, Resist not him that is evil: but whosoever smiteth thee on thy right cheek, turn to him the other also.