HOFFMEISTER WIKIPEDIA NO FURTHER A MYSTERY

[86] In concern that the town of giants would want vengeance on David for killing town's champion (Goliath) and many other Philistines, David pretended being insane. When he pretended to possess insanity he designed marks on town's gate and Allow saliva drool into his beard.[87] Achish was repulsed by David's meant sanity and so he had him expelled