Reference for Makkot 26:17
רבא אמר אתרו ביה לקטלא כ"ע לא פליגי דאין לוקה ומת כי פליגי דאתרו ביה למלקות רבי ישמעאל סבר לאו שניתן לאזהרת מיתת ב"ד לוקין עליו ור"ע סבר לאו שניתן לאזהרת מיתת ב"ד אין לוקין עליו
Rava[, who explains the dispute between Rebbi Akiva and Rebbi Yishmael differently,] says, If [the witnesses] warned him [the sinner that he would be liable] to court execution, then everyone would agree that he is not both flogged and executed. When do they disagree? When [the witnesses] warned him [that he would be liable] to malkus, for Rebbi Yishmael holds that a prohibition that has a scriptural warning for court execution can also be liable to malkus, and Rebbi Akiva holds that a prohibition that has a scriptural warning for court execution cannot also be liable to malkus.