12:7-8 A merchant who used dishonest scales loved to oppress his customers. Similarly Israel's oppression of others was traceable to pride in her riches. Much of Israel's dealing with the nations involved trading that deceit had contaminated. The Israelites considered their wealth a blessing from God that they interpreted as due to their cleverness and His approval of their lifestyle. Really it was due to His grace in spite of their sins.
12:9 Yahweh reminded His people that He had been their God since before the Exodus. He was able to make them revert to a humble wilderness lifestyle again, which their yearly feast of Booths (Tabernacles) reminded them about (cf. Lev. 23:33-43). This is clearly an allusion to the coming captivity of Israel.
12:10 The Lord also reminded them that He had spoken to them through prophets many times (cf. 9:7; 11:2). He had given the prophets visions, and they had taught their lessons to the Israelites. Nevertheless in spite of so many exhortations to return to the Lord the people had not responded.
12:11 What was going on in Gilead was an example of Israel's depravity (cf. 6:8-9). In Gilgal, too, worthless Israelites were sacrificing bulls, expensive offerings, on numerous altars that they had built there.80The number of the pagan altars at Gilgal was as great as the piles of stones that the farmers gathered beside their furrows. These altars would become simply piles of stones. There is a play on the name "Gilgal,"which sounds like the Hebrew word gallim, meaning "pile of stones."
The land that Israel occupied had very stony ground, and when farmers plowed they often hit stones that they had to remove from the fields. Evidently they would pile these stones beside their furrows.