What is the jurisprudential rooting for the problem of water remaining inside the opening of the penis after istinja’ and then exiting from it, knowing that this water is ritually impure and nullifies wudu’ according to a previous fatwa, and how can one escape this vicious cycle that affects purity and the validity of prayer?

Washing the outer part of the excretory opening with water is sufficient for istinja’ (purification after defecation/urination). The outer part refers to what water can reach without the need to force it in. It is not necessary to insert water into the inner passage or into what enters from it. Any remaining wetness is not najis (impure) and does not nullify wudu’ (ablution). Similarly, merely washing the head of the penis does not mean introducing water into it. Scholars warn against exposing the inner part of the excretory opening, as it leads to waswas (obsessive whispering/doubts), and it is impermissible to go to such lengths. For istinja’ from urine, wiping the excretory opening with a tissue or similar material that achieves cleanliness is sufficient, and it is preferable to wash the area with water afterward. However, if urine spreads beyond its usual place, reaching most of the glans, then washing with water becomes obligatory. Lingering in waswas concerning purity is treated by ignoring such thoughts, not prolonging one’s stay in the restroom beyond the usual time for istinja’, and it is recommended to sprinkle water on the private parts and trousers to cut off these waswas.