Who are "Pera'im"?
Rashi: They were savages who stay in the Midbar to ambush passersby.
Why does it say "Yatz'u b'Fa'alam Meshacharei la'Taref"?
Rashi: They go out to their work - to tear (victims and take their money).
Malbim: Every morning they go out to seek their prey.
What is the meaning of "Aravah Lo Lechem la'Ne'arim"?
Rashi: For the Rasha's servants and youths, the Aravah (Midbar) is the source of food 1 - they eat from what he steals. The youths go with him to steal, like "Rak Asher Achlu ha'Ne'arim."
Malbim: He finances his household only from the Midbar. He does not dwell in settled areas at all.
Ibn Ezra: He does not seek income from settled areas.
