1 Samuel 19:11

Saul also sent messengers unto David's house, which he had reached before nightfall, to watch him, and to slay him in the morning; and Michal, David's wife, told him, saying, If thou save not thy life tonight, tomorrow thou shalt be slain. The description given by David in Psalms 59, where he tells of this event, shows that there were jealous courtiers in attendance upon Saul, who were anxious to remove their powerful rival and therefore even added fuel to Saul's jealousy.