This narration does not contradict the ruling that urine must be washed for two reasons. First, it is possible that this ruling applies specifically to situations where water is not available, in which case it is permissible to suffice with stones. Second, the narration does not state that such wetness permits one to pray without washing; it merely states that the wetness emerging after istibra' is not harmful. This is correct, as it could refer to wadi (a fluid that commonly emerges after urination), which does not invalidate ablution according to our jurisprudence. Additionally, the Shaykh (Al-Mufid), may Allah سبحانه وتعالى support him, stated: "Whoever urinates must wash the outlet of urine and nothing more. Similarly, a person in a state of major ritual impurity (janabah) must wash his private part as part of the general washing (ghusl), and no separate act of istinja is required since the comprehensive washing of the body includes every area reached by water." This indicates the proper understanding of the rulings concerning such matters.
Commentary #47