The answer is: An idol

1 Samuel 19:13 - She placed an idol on his bed and covered it with goats hair and David's clothes

In 1 Samuel 19, Michal displays remarkable ingenuity and bravery. While David was on the run from Saul, Michal took drastic measures to preserve her husband's life. Using an idol to deceive Saul's messengers was both a playful and cunning tactic, reflecting the high stakes of the situation. It's worth noting that idols in ancient Israel were typically associated with pagan worship, which adds an ironic twist to Michal's strategy. While she was using a form of deception, she was doing it in defense of her husband, making it all the more fascinating.

Interestingly, the “idol” some translations refer to is often a household idol or perhaps a teraphim, well-known in ancient Near Eastern culture. These small figurines were common among families, used as objects of worship or as protectors. This incident highlights the tension between loyalty to one's people (in this case, the house of Saul) versus loyalty to family. Michal’s act signals a shift in her allegiance, embracing David over Saul.

Moreover, this episode sheds light on the role women played in the biblical narrative. Michal, despite being a princess, shows an incredible will and intelligence, using her position and resources strategically.

The rich tapestry of the Hebrew scriptures often blends elements of intrigue, loyalty, and personal sacrifice, which still resonate today. The story leaves us pondering the nuances of relationships and how they sometimes require us to navigate through deception not for malevolent purposes, but rather, in a quest for love and safety.