Isaiah 57:8

The unfaithful Israelites were evidently setting up memorial objects to the idols in their homes as well. The Scripture portions that they were to place on their doorframes (Deuteronomy 6:9; Deuteronomy 11:20) were to remind them of the Lord, but they had installed rival reminders inside their homes. The holder of these Scripture portions is called a mezuzah, and many observant Jews still install them on their doorframes, even today. The Lord’s "wife" had turned her back on Him and had gone to bed with other lovers. She had been unfaithful to her covenant with Yahweh and had covenanted to worship idols, since she loved the physical aspects of their worship.