Reference for Pesachim 126:6
ור"ש בן לקיש אמר אינו לוקה משום דהוה ליה התראת ספק והתראת ספק לא שמה התראה אבל לאו שאין בו מעשה לוקין עליו
as a warning.<span class="x" onmousemove="('comment',' For naturally until the last moment of the day only a doubtful warning can be given, as we do not know that he will permit the day to pass without eating it.');"><sup>9</sup></span> While R'Simeon B'Lakish said, He is not flagellated, because it is a doubtful warning, and a doubtful warning does not count as a warning; but as for a negative command not involving an action, we flagellate for it! I will tell you: After all they differ in whether 'with' implies near, yet it is necessary.<span class="x" onmousemove="('comment',' For them to differ in both cases.');"><sup>10</sup></span>