Al-Matalib al-'Aliyah 193 — Ghusl after a wet dream

It is narrated from Sayyiduna Abdullah bin Amr bin al-As (may Allah be pleased with them both) that a woman named Busrah (may Allah be pleased with her) came to the Prophet (peace and blessings be upon him) and said: "O Messenger of Allah! One of us women sees (in a dream) that she is with her husband (that is, she has a wet dream; what is the ruling)?" He (peace and blessings be upon him) said: "O Busrah! When you find wetness (on waking), take a bath." The narrator states that at this Sayyidah Aishah (may Allah be pleased with her) said to her (out of modesty): "You have disgraced the women!" The Prophet (peace and blessings be upon him) said (to Sayyidah Aishah (may Allah be pleased with her)): "Leave her; she is asking about the matter that has arisen for her. 'Tariba jabinuki, aw taribat yaminuki' (May your forehead be covered in dust, or may your right hand be covered in dust)."
Takhrij and grading: the chain of this narration contains Abdullah bin al-Mu'ammal, a weak narrator; however, the obligation of ghusl upon finding wetness after a wet dream is established by other authentic and reliable hadith.