Commentaries:
Jamieson, Fausset, and Brown
feigned himself mad—It is supposed to have been an attack of epilepsy, real or perhaps only pretended. This disease is relieved by foaming at the mouth.
let his spittle fall down upon his beard—No wonder that Achish supposed him insane, as such an indignity, whether done by another, or one's self, to the beard, is considered in the East an intolerable insult.
Other Jamieson, Fausset, and Brown entries containing 1 Samuel 21:13:
1 Samuel 21:10
Job 6:6
Psalms 34:1-4
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