Adam Clarke on Micah 1:5

What is the transgression of Jacob? - Is it not something extremely grievous? Is it not that of Samaria? Samaria and Jerusalem, the chief cities, are infected with idolatry. Each has its high places, and its idol worship, in opposition to the worship of the true God. That there was idolatry practiced by the elders of Israel, even in the temple of Jehovah, see Eze 8:1, etc. As the royal cities in both kingdoms gave the example of gross idolatry, no wonder that it spread through the whole land, both of Israel and Judah.