The Messenger of Allah ﷺ said, "Three things do not break the fast of the one fasting: cupping, vomiting, and a wet dream."
حدثنا محمد بن عبيد المحاربي حدثنا عبد الرحمن بن زيد بن أسلم عن أبيه عن عطاء بن يسار
قال رسول الله ﷺ ثلاث لا يفطرن الصائم الحجامة والقيء والاحتلام
No references are available.
Its chain is daif. Abd bin Humayd narrated it, no. 959, from the hadith of Abdul-Rahman bin Zayd bin Aslam from him, and this is very daif, from his father. The hadith has daif corroborating narrations found in Daraqutni, 2/183, and Bazzar (Kashf), no. 1017, and others.