Harun ibn Muslim, from Masadah ibn Sadaqah, from Imam Jafar al-Sadiq عليه السلام, from his father عليه السلام, from his forefathers عليه السلام, peace be upon them: Imam Ali عليه السلام, peace be upon him, was asked about ‘a fly entering the throat of a fasting person.’ Imam عليه السلام said: “There is no making up upon him; indeed, it is not food.”