The same applies to what common people call a muhadhri: someone who has reached extreme old age and begun to confuse his speech. His words carry no legal weight.
“And one incapable of intercourse because of complete castration or paralysis: if he says, ‘By Allah, I will never have intercourse with you,’ or specifies a period exceeding four months, or until Jesus descends, or the Dajjal emerges, …”
His statement, “and one incapable of intercourse because of complete castration,” means that ilaʾ is not valid from one incapable of intercourse, where the incapacity is not expected to cease—either because he has lost the organ, which is what is meant by “complete castration.” Castration means the removal of the penis. One whose penis has been removed, whether he swears or does not swear, cannot have intercourse; how could intercourse possibly be conceived of in his case? But if half of his penis has been removed, such that he is still able to have intercourse with what remains, then ilaʾ is valid from him.
His statement, “or paralysis,” refers to the loss of movement in the organ. Thus, if the organ is paralysed, ilaʾ is not valid from him, because the incapacity to have intercourse is not expected to cease. His abstention from intercourse is due to a physical defect. Indeed, even if a castrated man said to his wife, “By Allah, I will not have intercourse with you,” she would say to him, “You are not going to have intercourse with me, whether you swear or not.” The same applies to one who is paralysed.
His statement, “if he says, ‘By Allah, I will never have intercourse with you,’” is an oath formula: the wāw is the particle of oath, and the response to the oath is “I will not have intercourse with you,” which is grammatically a past-tense verb. If it is asked, “How can he say, ‘By Allah, I will not have intercourse with you’?” we reply: when a past-tense verb occurs as the response to an oath and is coupled with lā (not), it conveys the future sense. Thus, his saying, “By Allah, I will not have intercourse with you,” is like saying, “By Allah, I will not have intercourse with you.” This differs from when it is coupled with mā (not), as in, “By Allah, I did not have intercourse with you,” for that refers to the past.
Thus, if he says, “By Allah, I will never have intercourse with you,” he has made ilaʾ, because “never” exceeds four months. Likewise, if he says, “By Allah, I will not have intercourse with you,” he has made ilaʾ.
His statement, “or specifies a period exceeding four months,” such as when he says: