Muhammad bin Ali bin Mahbub, from Al-Abbas, from Abdullah bin Al-Mughirah, from Mu'awiyah bin Ammar: I asked Abu Abdullah عليه السلام about a man who experienced a wet dream, and when he woke up, he found a small amount of wetness. Imam عليه السلام said: "It is nothing unless he is ill, for in that case, he becomes weak, and ghusl is required."