Rules regarding Wudhu

305. If a person doubts too often about the acts of Wudhu and its conditions, like, regarding the water being Pak, or it not being usurped, he should not pay any heed to such doubt.

306. If a person doubts whether his Wudhu has become void or not, he should treat it as valid. But, if he did not perform Istibra after urinating, and performed Wudhu, and thereafter some fluid was discharged about which he was not sure whether it was urine or something else, his Wudhu will be void.

307. If a person doubts whether he has performed Wudhu or not, he should perform Wudhu.

308. If a person is sure that he has performed Wudhu, and has also committed an act which invalidates Wudhu e.g. urinating, but does not remember which happened first, he should act as follows:

If this situation arises before his Namaz, he should perform Wudhu.
If it arises during Namaz, he should finish the Namaz and perform Wudhu and repeat the Namaz.
If it arises after Namaz, that Namaz will be valid, but for the next prayers, however, he should perform Wudhu.

309. If after or during Wudhu, a person becomes sure that he has not washed certain parts or has not wiped them, and if the moisture of the parts preceding them has dried up due to lapse of time, he should perform Wudhu again. And if the moisture has not dried up, he should wash or wipe the forgotten part as well as the parts which follow. Similarly, if during Wudhu he doubts whether he has washed or wiped a part or not, he should follow the same rule as above.

310. If a person doubts after Namaz, whether he performed Wudhu or not, if before praying he was aware about the ruling of requirement of Wudhu for the Namaz, the prayers offered by him would be valid. However, for the next prayers, he should perform Wudhu.

311. If a person doubts during Namaz whether he has performed Wudhu, as per obligatory precaution, he should finish his prayer, and he should perform Wudhu and then pray again.

312. If a person realizes after offering prayers, that his Wudhu became void, but doubts whether it became void before Namaz or after, the prayers offered by him will be deemed in order.

313. If a person suffers from an incontinence, due to which drops of urine come out continuously, or he cannot control his bowels, he should act as follows:

If he is sure that at some time during the prayer time, there will be a respite during which there will be a restraint, then he should perform Wudhu and Namaz at such time.
If during the restraint, he can control his urine or excretion only for performing Wajib(obligatory) acts of Namaz, then he should perform only obligatory acts, and abandon the Mustahab acts e.g. Adhan, Iqamah, Qunoot etc.

314. If the time of restraint is not enough for Wudhu and Namaz, and he discharges urine or excretion several times during Namaz, and if it is not difficult for him to renew his Wudhu every time, he should keep water beside him so that whenever urine or excretion discharges he could do Wudhu and complete the remaining prayer. And if one cannot control the discharge of urine and excretion in between the Namaz and also performing Wudhu every time in the middle of Namaz will disturb the continuity of Namaz (Muwalaat), as per obligatory precaution, one should pray the same Namaz again with a new Wudhu, and one should not pay attention if his Wudhu voids.

315. If there is a continued incontinence, and it is difficult to perform Wudhu every time, then he should perform one Wudhu for every Namaz, in such case one should pray at least a part of Namaz with the Wudhu he performed.

316. A person suffering from continued incontinence, who cannot perform even a part of Namaz with Wudhu, as per obligatory precaution, one should perform fresh Wudhu for every Namaz. 

317. If a person is suffering from a disease because of which he cannot control the stomach wind, he should follow the rulings same as the person suffering from continued incontinence.

318. It is necessary for a person suffering from continued incontinence, to do a fresh Wudhu for every Namaz and pray immediately after Wudhu, however, a fresh Wudhu is not necessary for the Qadha of a forgotten Sajdah, or Tashahhud, or for the prayers of Ihtiyat, if it is performed immediately after Namaz.

319. A person, who cannot control urine, should use a bag filled with cotton or some similar thing, to protect himself, and to prevent urine from reaching other places, and the obligatory precaution is that before every Namaz, he should wash the outlet of urine which has become Najis.
Moreover, a person who cannot control excretion should, if possible, prevent it from reaching other parts, at least during the time required for Namaz. And the obligatory precaution is that if no hardship is involved, he should wash the anus for every prayer.

320. A person who suffers from incontinence should, if possible, try to restrain himself at least for the duration of Namaz, even if it costs him. In fact, if his ailment can be treated easily, as per obligatory precaution, he should get the necessary treatment.

 321. If a person, who suffered incontinence, recovers from the ailment, it is not necessary for him to repeat those prayers which he offered according to his religious duty, during the period of his ailment. However, if he recovers during Namaz, he should repeat that prayer.