1)
What are the implications of the words "Va'yitzamed Yisrael le'Ba'al Pe'or "?
1.
Targum Yonasan: It implies that they clung to Ba'al Pe'or like a nail in a piece of wood, which can only be extracted with difficulty. 1
2)
Why was the idol called "Ba'al Pe'or"?
3)
What aroused Hashem's anger?
1.
Oznayim la'Torah: The fact that they worshipped Ba'al Pe'or - because in spite of the fact that Hashem hates adultery, the term 'Charon Af' appears in connection with Avodah Zarah exclusively.
4)
What were the ramifications of Hashem's anger?
1.
Rashi and Rashbam: He sent a plague that began to consume them.