Hadith.187 – Ubaydullah ibn Ali Al-Halabi narrates that Imam Jafar ibn Muhammad Al-Sadiq عليه السلام was asked about a man who performs ghusl (ritual bathing) and then later finds wetness, having urinated before performing the ghusl.
Imam عليه السلام said: 'He should perform wudu (ablution). But if he had not urinated before performing the ghusl, he should repeat the ghusl.'