1)
What should they remember?
1.
Rashi: What I want to say.
2.
Malbim: The detriment that I said about the idol.
2)
What is the meaning of "His'oshashu"?
1.
Rashi, Targum Yonasan: Strengthen yourselves. This is like "la'Ashishei Kir Chareshes" (16:7).
2.
Radak: It is from the root Ish. Be people, and not animals, which do not grow wise!
3.
Radak citing his father: It is from the root Esh
3)
What should the sinners put to heart"?
1.
Rashi: What I will tell you to remember.
2.
Malbim: These matters. (If they would do so, they would easily see their folly!)