Sforno on Exodus 23:23/ספורנו על שמות כ״ג:כ״ג

1כי ילך מלאכי לפניך, who will not waive any of the sins of your enemies. [the angel, by definition, will not forgive, tolerate insubordination, but this would boomerang on the Jewish people to whom he will not show special favour either. Ed.]