Saul sent messengers to David's house, to watch him, and to kill him in the morning: and Michal, David's wife, told him, saying, If you don't save your life tonight, tomorrow you will be slain.
"Michal let David down through the window"  (1 Samuel 19:12).  This indicates, of course, that the house of David and Michal was on the city wall, as befitted a member of the king's family, and therefore, just as Rahab had aided the spies sent out by Joshua, and just as the apostle Paul escaped from Damascus, so David here escaped the fury of Saul's murderous "messengers"  (Joshua 2:15;  Acts 9:25).