Beth-aven

house of nothingness; i.e., "of idols", a place in the mountains of Benjamin, east of Bethel (Josh 7:2; 18:12; 1Sam 13:5 ). In (Hos 4:15 ; 5:8; 10:5) it stands for "Bethel" (q.v.), and it is so called because it was no longer the "house of God," but "the house of idols," referring to the calves there worshipped.

EBD - Easton's Bible Dictionary