I found Israel like grapes in the wilderness. I saw your fathers as the first ripe in the fig tree at its first season; But they came to Baal Peor, and consecrated themselves to the shameful thing, And became abominable like that which they loved.
In this verse, Hosea announced that the king of Moab, whose campaign against Israel started in the times of the wilderness wanderings, had at last succeeded in destroying Israel.  The beginning and the end of Israel's rebellion against God was Baal-peor.