Mattityahu 5:36-38

Orthodox Jewish Bible

³⁶ Neither are you to swear by your rosh, for you are not able to make one hair turn white or black.

³⁷ But let your word be ken, ken (yes, yes) or lo, lo (no, no), but anything beyond this is lashon horah.

³⁸ You have heard that it was said, AYIN TACHAT AYIN, SHEN TACHAT SHEN (An eye for an eye and a tooth for a tooth SHEMOT 21:24).