'Altars' in the Bible

Because Ephraim hath made many altars to sin, altars shall be unto him to sin.

Israel is an empty vine, he bringeth forth fruit unto himself: according to the multitude of his fruit he hath increased the altars; according to the goodness of his land they have made goodly images.

Their heart is divided; now shall they be found faulty: he shall break down their altars, he shall spoil their images.

The high places also of Aven, the sin of Israel, shall be destroyed: the thorn and the thistle shall come up on their altars; and they shall say to the mountains, Cover us; and to the hills, Fall on us.

Is there iniquity in Gilead? surely they are vanity: they sacrifice bullocks in Gilgal; yea, their altars are as heaps in the furrows of the fields.