1)
What do we learn from "Tzarur Avon Efrayim"?
1.
Rashi: I did not pardon their sin. It is stored with Me.
2.
Radak: It is guarded with Me, like something guarded in a tied bundle - "Chasum bi'Tzrir Pish'i" (Iyov 14:17). The Avon and Chatas are the calves.
3.
Malbim: Efrayim does not abandon its sins. Rather, its Avon is bound in it and its Chet is stored. It does not want to repent!