1)
What is the meaning of "Al Timshecheni"?
1.
Rashi: Do not accustom me.
2.
Radak: I should not be drawn [to death like them]. This is like "v'Acharav Kol Adam Yimshoch" (Iyov 21:33).
3.
Malbim: I should not be drawn into a net via Resha'im.
2)
Why did he fear to be with Resha'im?
1.
Radak: He should not die like them - "Al Te'asef Im Chata'im Nafshi" (26:9).
3)
Why does it say "v'Ra'im b'Libam"?
1.
Radak: Most Resha'im do not reveal [their evil]. They show themselves to be b'Shalom with their colleagues, and plot evil in their hearts. Malbim - it is hard to beware of them. I can easily be drawn after them into the net!