Hadith 4:612
Muhammad bin Bakr narrated to us, from Ibn Jurayj, from ‘Ata’, who said: "If a fasting person ejaculates, he has broken his fast." I said: "Does he perform the expiation (kaffarah) for ejaculation?" He said: "Yes."
حدثنا محمد بن بكر عن بن جريج عن عطاء قال إذا أمنى الصائم أفطر قلت فيكفر كفارة المني قال نعم