1)
What are "Ketzutzei Pe'ah"?
1.
Rashi: They are cast off at the end of the directions.
2.
Malbim: Because they are from Bnei Yishmael, who cut their Orlah. They are always called so for disgrace, for they are not properly circumcised, with Peri'ah (pulling back the flesh so the Milah is recognized).
2)
Why does it say "mi'Kol Avarav"?
1.
Malbim: Wherever they will be [I will bring their downfall].
