If a person suffers from an illness that causes urine to be discharged drop by drop [i.e. urinary incontinence], or if he cannot control faeces from being discharged [i.e. faecal incontinence], in the event that he is certain he will have some respite from a discharge between the beginning and the end of the prayer time such that he will be able to perform wuḍūʾ and the prayers during the period of respite, he must perform prayers at the time he has the respite.
If the respite is long enough to perform only the obligatory acts of prayers, then at the time he has the respite, he must perform only those acts of the prayer that are obligatory and leave the recommended acts, such as the call to prayer (adhān), the call to stand up for prayer (iqāmah), and the supplication that is recited with the hands placed in front of the face (qunūt).
Ruling 307.* If a person finds respite [from the illness mentioned in the previous ruling] to perform wuḍūʾ and only part of the prayer, and during prayers some urine or faeces is discharged once or a few times, the obligatory precaution is that in the respite period he must perform wuḍūʾ and prayers.
Furthermore, it is not necessary that he renew his wuḍūʾ on account of a discharge of urine or faeces during or after prayers; rather, one wuḍūʾ will suffice for several prayers unless he does something else that invalidates his wuḍūʾ, such as sleeping, or he discharges urine or faeces in a normal manner. However, it is better that he perform wuḍūʾ for the next prayer.