1 Samuel 21:15

New American Bible - revised edition

Finally Achish said to his servants: “You see the man is mad. Why did you bring him to me?

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Princes persecute me without reason, but my heart reveres only your word.

So, he feigned insanity in front of them and acted like a madman in their custody, drumming on the doors of the gate and drooling onto his beard.

David left Gath and escaped to the cave of Adullam. When his brothers and the rest of his family heard about it, they came down to him there.