Avicenna on the law of non-contradiction

[Anyone who denies the law of non-contradiction] must be plunged into fire, since fire and non-fire are identical. Let him be beaten, since suffering and not suffering are the same. Let him be deprived of food and drink, since eating and drinking are identical to abstaining

Ibn Sina (Avicenna), Metaphysics I.8, 53.13–15