Musannaf Ibn Abi Shaybah 29339 — An insane person who commits

Hisham said that al-Hasan al-Basri said, regarding an insane person, one overcome in his mind, one lacking understanding, and one who suffers a fit once or twice a month: "When that condition leaves him, and he then fasts, prays, understands matters and harms someone, the penalty is due from him."