1 Samuel 21:8-15

David said to Ahimelech, “Now is there not a spear or a sword on hand? For I brought neither my sword nor my weapons with me, because the king’s matter was urgent.” Then the priest said, “The sword of Goliath the Philistine, whom you killed in the valley of Elah, behold, it is wrapped in a cloth behind the ephod; if you would take it for yourself, take it. For there is no other except it here.” And David said, “There is none like it; give it to me.” Then David arose and fled that day from Saul, and went to Achish king of Gath. But the servants of Achish said to him, “Is this not David the king of the land? Did they not sing of this one as they danced, saying, ‘Saul has slain his thousands, And David his ten thousands’?” David took these words to heart and greatly feared Achish king of Gath. So he disguised his sanity before them, and acted insanely in their hands, and scribbled on the doors of the gate, and let his saliva run down into his beard. Then Achish said to his servants, “Behold, you see the man behaving as a madman. Why do you bring him to me? Do I lack madmen, that you have brought this one to act the madman in my presence? Shall this one come into my house?”