How was their heart divided?
Rashi: It was separated from Me.
Rashi citing Sifri Nasa 42: Great is Shalom - even if Yisrael serve idolatry, but there is Shalom among them, the Satan cannot prosecute - "Chabur Atzabim Efrayim Hanach Lo" (4:17). Feuds are hated - "Chalak Libam Atah Yeshamu", the Satan can prosecute.
Radak: It is separated from fear of Kel, and from His Torah. Chalak is Po'el Omed (the action applies only to the subject), like Nechlak.
Malbim: Hashem divided it. He caused dissension among them and opposing groups.
What guilt will they have now?
Rashi: Refer to 10:2:1:2.
Radak: "Yeshamu" is an expression of Shemamah (desolation), like "Tesham Shomron" (14:1).
Malbim: They will receive their punishment.
Malbim (3): Until now, the kings forced the nation to serve the calves - the guilt was on the king. Now, the king wants to abolish the calves, and the nation wants to persist in them - the guilt is on their heads.
Why does it say "Hu Ya'arof Mizbechosam"?
Rashi: This is destruction, like "v'Arfu Sham" (Devarim 21:4), "V'Arafto" (Shemos 13:13) - he breaks their neck.
Radak: This division will destroy their many Mizbechos and plunder their Matzevos. It will be at the time of the Churban. Ya'arof is destruction and breakage. So some explain "Chashach ba'Arifeha" (Yeshayah 5:30).
Malbim: This division will destroy their Mizbechos and plunder their Matzevos. The king who reigned in place of the first, he will cut off the Mizbechos of the calves. So did Shalum ben Yavesh and Hoshe'a ben Elah, and via this they rebelled against the king.
What is "Yeshoded"?
Radak: It is breakage and plundering. The last letter of the root is doubled; it is like a four-letter root.
