'Altars' in the Bible

For according to the number of your cities are your gods, Judah; and according to the number of the streets of Jerusalem have you set up altars to the shameful thing, even altars to burn incense to Baal.

The sin of Judah is written with a pen of iron, [and] with the point of a diamond: it is engraved on the tablet of their heart, and on the horns of your altars;

while their children remember their altars and their Asherim by the green trees on the high hills.