Final answer:
Hosea 4:13 discusses the idolatrous practices of the people, where they participate in sacrifices and incense burning on mountains and hills, signifying their deviation from the worship of God.
Step-by-step explanation:
In Hosea 4:13, the verse states: "They sacrifice on the mountaintops and burn offerings on the hills, under oak, poplar, and terebinth, because their shade is good." This biblical verse from the book of Hosea is a part of the prophet's critique of Israel's idolatry and unfaithfulness to God. The people are condemned for engaging in pagan practices, particularly the offering of sacrifices on elevated places like mountaintops and hills. The mention of specific trees like oak, poplar, and terebinth indicates the locations where these idolatrous rituals were taking place. The critique in this passage is a part of Hosea's broader message urging Israel to return to the worship of the one true God and abandon idolatrous practices.