David is now a fugitive. He knows that Saul intends harm against him. Jonathan has proved himself a loyal friend and has risked his relationship with his father and his own life, to help David. Saul only sees evil in David, wrongly believing that David is bent on overthrowing him and seizing the crown. David flees, going firstly to the priest at Nob. But Doeg, an Edomite, sees David there and reports this to Saul, which leads to the deaths of all the priests, except for Abiathar, who manages to escape and bring word to David.
David seeks refuge among the Philistines in Gath. He feigns madness, realising that he is in danger and hides in the Cave of Adullam, before leaving to lead a nomadic existence with his followers. All the time he is being pursued by Saul. This is the experience of the true church, persecuted by Satan, and having to find help and refuge in the wilderness (Revelation 12:13-17).
1: Bad tactics 2: Betrayal is a reality 3: The bonds of fellowship