Then Saul sent troops to watch David's house. They were told to kill David when he came out the next morning. But Michal, David's wife, warned him, "If you don't get away tonight, you will be dead by morning."
So she helped him climb out through a window, and he escaped.
Then she took an idol and put it in his bed, covered it with blankets, and put a cushion of goat's hair at its head.
References for 1 Samuel 19:13
When the troops came to arrest David, she told them he was sick and couldn't get out of bed.
"Then bring him to me in his bed," Saul ordered, "so I can kill him as he lies there!" And he sent them back to David's house.
But when they came to carry David out, they discovered that it was only an idol in the bed with a cushion of goat's hair at its head.
"Why have you tricked me and let my enemy escape?" Saul demanded of Michal. "I had to," Michal replied. "He threatened to kill me if I didn't help him."