1 Samuel 19:12 (KJV)

And Saul sought to smite David even to the wall with the javelin; but he slipped away out of Saul’s presence, and he smote the javelin into the wall: and David fled, and escaped that night.

Saul also sent messengers unto David’s house, to watch him, and to slay him in the morning: and Michal David’s wife told him, saying, If thou save not thy life to night, to morrow thou shalt be slain.

So Michal let David down through a window: and he went, and fled, and escaped.

And Michal took an image, and laid it in the bed, and put a pillow of goats’ hair for his bolster, and covered it with a cloth.

And when Saul sent messengers to take David, she said, He is sick.