'Adultery' in the Bible

Gideon crafted the booty into an ephod and enshrined it in his home town of Ophrah. Then all of Israel committed spiritual adultery with it there, and it became a snare for Gideon and his household.

Later on, as soon as Gideon was dead, the Israelis again committed spiritual adultery with various Canaanite deities and appointed Baal-berith to be their god.