1)
Were they truly "Nevi'eha"?
1.
Rav Sadya Gaon: They were Misnav'eha (they claimed to have prophecy, i.e. false Nevi'im - Rashi).
2.
Ibn Ezra: They were Nevi'im of the Ba'al.
2)
What was the Kohanim's sin?
1.
Rashi: These were Kohanim of the Bamos.
3)
What resulted from the sin of the Nevi'im and Kohanim?
1.
Ibn Ezra: The blood of Tzadikim was spilled, like Asaf said (Tehilim 78-79).
2.
Ri Kara, Palgei Mayim (12): This enabled the enemy to enter Yerushalayim.
4)
Why does it say "Dam (singular) Tzadikim (plural)"?
1.
Ibn Ezra: It is the blood of every Tzadik.