Charles Spurgeon Commentary Jeremiah 17:2

"whilst their children remember their altars and their Asherim by the green trees upon the high hills." — Jeremiah 17:2 (ASV)

God forbade the setting up of altars. There was one altar at Jerusalem, and there were to be no more; but they selected spots where great trees had long grown, they chose the tops of the hills, and they built shrines for their idols there; and there God was angry with them. Oh, how readily we may turn anything into sin! How easily our choicest mercies may be made into occasions of iniquity!