Rashi on Exodus
ושמתי פדות AND I WILL MAKE A DELIVERANCE which shall serve as a division BETWEEN MY PEOPLE AND THY PEOPLE.
Rashbam on Exodus
ושמתי פדות, a word describing “separation.” Words such as ישועה, הצלה, חלצה, פורקן are all expressions denoting different separations, isolation of one thing from another.
Sforno on Exodus
ושמתי פדות בין עמי ובין עמך, so that even the few members of my people who might be in an area infested by the arov would not be molested by these beasts. The same beasts would harm your people on the same spot.