Sforno on Exodus 23:27/ספורנו על שמות כ״ג:כ״ז

1ונתתי את כל אויביך אליך עורף, they will turn their backs to you out of fear and the confusion in accordance with My promise

2את אימתי אשלח לפניך והמותי, the same had happened when the Egyptians were at the bottom of the sea bed when the waves began crashing down on them, and they said” I will flee from the Israelites for G’d is fighting for them.” (Exodus 14,25)