1)
Why does it say "Asher Lo Yishma l'Kol Melachashim"?
1.
Rashi: This is connected to verse 5. It covers its ear lest it hear the Lachash. Radak - so these people do not hear the oppressed Tzadik in his case, and they judge him according to their hearts and desires.
2.
Malbim: Refer to 58:5:2:3.
2)
Who is "Chover Chavarim"?
1.
Rashi: It is one who knows how to whisper to snakes.
2.
Radak: He knows the Chachmah of whispering to snakes and does actions so the Lachash will work.