so he sells it in a corrupt sale, he does not violate his oath. Our evidence is that this is meat in reality and in common custom, so he violates his oath by eating it, like usurped meat. God Almighty has named it meat, saying: "And the meat of swine." What they mentioned is invalidated by the case where one swears not to wear a garment, then wears a silk garment. As for the corrupt sale, he does not violate his oath by it because it is not a sale in reality.

Section: Names are divided into six categories. The first is that which has one named object, such as man, woman, human, and animal; the oath refers to its named object without disagreement. The second is that which has a legal subject and a linguistic subject, such as ablution (wudu), purification (tahara), prayer (salah), almsgiving (zakat), fasting (sawm), pilgrimage (hajj), minor pilgrimage ('umra), sale (bay'), and the like; the oath refers in an absolute sense to its legal subject rather than its linguistic one. We know of no disagreement in this, other than what we mentioned previously. The third is that which has a literal subject and a metaphorical one that is not more famous than the literal, such as lion and sea; the oath of the one who swears refers in an absolute sense to the literal meaning rather than the metaphorical, because when the speech of the Lawgiver arrives regarding such a matter, it is carried upon its literal meaning rather than its metaphor, and the oath is the same. The fourth is customary names, which are those whose metaphorical meaning becomes so famous that the literal meaning becomes obscured within it. This is of several types. One type is that which prevails over the literal meaning such that most people do not know it, such as "rawiya"; in common custom, it is a name for a water skin (mazada), while in reality, it is a name for the animals upon which water is carried. "Za'ina" in common custom is a woman, while in reality, it is a she-camel upon which one travels. "'Adhira" and "gha'it" in common custom are filthy waste, while in reality, 'adhira is the courtyard of a house; that is why Ali, may God be pleased with him, said to a people: "Why do you not clean your courtyards?" meaning your courtyards. And "gha'it" is the low-lying place [of the earth]. This and its likes refer in the oath of the one who swears to the metaphorical meaning rather than the literal, because that is what he intends by his oath and what is understood from his speech, so it resembles the literal in other cases. The second type is that customary usage restricts some of the literal meaning by the name.