The biblical account of David's first escape from Saul in 1 Sam 19 mentions that his wife Michal camouflaged his escape by hiding an "image" (KJV) or a "household idol" (NASB) in his bed.
Is that to mean that David allowed idols in his own home?
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Idols were commonplace in David's time, perhaps his wife Michal went out and purchased one to help cover up his escape.
Another possibility is that other residents in his household worshiped the idols and David never expressly forbade idols from his household, thus Michal may have borrowed or moved an idol from elsewhere in the house.
Any idol large enough to simulate a human in bed is too large to go unnoticed by David, so the idea that David did not notice the household idol doesn't seem to wash. So why did David allow it? Anything we say is conjecture because at this point we aren't told anything else about it. You could project that they were so commonplace that David just wanted to keep the peace with Michal and chose not to make it an issue. We're drawn to this bit of info because it would seem so unlike David to permit this.