Hosea 4:15

The Lord warned the Israelites not to pollute their brethren in the Southern Kingdom with their unfaithfulness. He also warned them not to go to the pagan shrines and take an oath in His name since they did not really worship Him. This was pure hypocrisy. Gilgal and Beth-aven were representative pagan cultic sites (cf. Hosea 9:15; Hosea 12:11; Amos 4:4). The prophet had come to refer to Bethel (house of God) by the name Beth-aven (house of wickedness) because it had become one of the main centers of idolatry in Israel since the reign of Jeroboam I (cf. Hosea 10:5; Amos 5:5). The use of one name to represent a different though similar place is a figure of speech called atbash.