Praise be to Allah, and may Allah’s peace and blessings be upon the Messenger of Allah, his family and his companions. Wa ‘alaykum salaam wa rahmatullahi wa barakaatuhu To proceed: For a fasting person to be considered to have broken his fast with regard to all the things that break fast, it is stipulated that the breaking of the fast should occur based on knowledge, choice and awareness. Thus what reaches the throat unintentionally does not nullify the fast because the person did not intend that nor did he choose it. Allah the Exalted said : )وَلَيْسَ عَلَيْكُمْ جُنَاحٌ فِيمَا أَخْطَأْتُمْ بِهِ وَلَكِنْ مَا تَعَمَّدَتْ قُلُوبُكُمْ( “ And there is no blame upon you for that in which you have erred but [only for] what your hearts intended.” [ Surah Al-Ahzaab (33): 5]. A hadeeth which the scholars agreed upon its correctness of its meaning, and which was transmitted by Ibn Maajah (no. 2045) from the hadeeths of Ibn ‘Abbaas (may Allah be pleased with him and his father) states: “"Allah has forgiven my nation for mistakes and forgetfulness, and what they are forced to do."
Dr. Khaalid al-Mosleh 19/10/1428AH